Head-to-head comparison
Claude Fable 5 vs. DeepSeek-V4-Flash
Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.
- shared result series
- 58
- distinct benchmarks
- 1
- latest retrieval
- 2026-09-04
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Specifications
General specifications
Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.
| Attribute | Claude Fable 5 | DeepSeek-V4-Flash |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Released | Jun 9, 2026 | Apr 24, 2026 |
| Availability | Active | Preview |
| Model type | Proprietary | Open Weights |
| Parameters | Not published | 284B, 13B active |
| Architecture | Not published | Mixture of Experts |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Knowledge cutoff | January 2026 | Not published |
| Technical sources | Model, Context, Knowledge cutoff | Model |
Pricing
API pricing compared
The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.
| Price type | Claude Fable 5 | DeepSeek-V4-Flash |
|---|---|---|
| API input | $10 | $0.14 |
| API output | $50 | $0.28 |
| Cache read | $1 | $0. |
| Cache write (5 min.) | $12.5 | Not listed |
| Cache write (1 hr.) | $20 | Not listed |
| Price verified | 07/30/2026 Source | 07/30/2026 Source |
Claude Fable 5DeepSeek-V4-Flash
API inputUSD per 1M tokens, base tier
Claude Fable 5$10
DeepSeek-V4-FlashLower price$0.14
API outputUSD per 1M tokens, base tier
Claude Fable 5$50
DeepSeek-V4-FlashLower price$0.28
Cache readUSD per 1M tokens, base tier
Claude Fable 5$1
DeepSeek-V4-FlashLower price$0.003
Key to the marks:better valuebetter, but not conclusivetie
Pricing by provider
Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.
| Model | Provider | Purchase route and tariff | Input per 1M tokens | Output per 1M tokens | Source |
|---|---|---|---|---|---|
| Claude Fable 5 | Anthropic | Direct from developerStandard API | Lowest listed price: $10 | Lowest listed price: $50 | Source07/30/2026 |
| Amazon Bedrock | Via OpenRouteramazon-bedrock | Lowest listed price: $10 | Lowest listed price: $50 | Source09/07/2026 | |
| Anthropic | Via OpenRouteranthropic | Lowest listed price: $10 | Lowest listed price: $50 | Source09/07/2026 | |
| Azure | Via OpenRouterazure | Lowest listed price: $10 | Lowest listed price: $50 | Source09/07/2026 | |
| Claude Platform on AWS | Via OpenRouterclaude-on-aws | Lowest listed price: $10 | Lowest listed price: $50 | Source09/07/2026 | |
| Via OpenRoutergoogle-vertex/europe | $11 | $55 | Source09/07/2026 | ||
| Via OpenRoutergoogle-vertex/global | Lowest listed price: $10 | Lowest listed price: $50 | Source09/07/2026 | ||
| DeepSeek-V4-Flash | DeepSeek | Direct from developerStandard API | $0.14 | $0.28 | Source07/30/2026 |
| Alibaba | Via OpenRouteralibaba | $0.352 | $1.056 | Source09/07/2026 | |
| AtlasCloud | Via OpenRouteratlas-cloud/fp4 | $0.44 | $1.32 | Source09/07/2026 | |
| Baidu | Via OpenRouterbaidu/fp8 | $0.14 | $0.28 | Source09/07/2026 | |
| BaseTen | Via OpenRouterbaseten/fp8#1 | $0.13 | $0.26 | Source09/07/2026 | |
| BaseTen | Via OpenRouterbaseten/fp8#2 | $0.13 | $0.26 | Source09/07/2026 | |
| Cloudflare | Via OpenRoutercloudflare | $0.44 | $1.32 | Source09/07/2026 | |
| CoreWeave | Via OpenRoutercoreweave/fp8 | $0.13 | $0.28 | Source09/07/2026 | |
| DeepInfra | Via OpenRouterdeepinfra/fp8 | $0.06 | $0.18 | Source09/07/2026 | |
| DeepSeek | Via OpenRouterdeepseek | $0.22 | $0.66 | Source09/07/2026 | |
| DigitalOcean | Via OpenRouterdigitalocean | $0.08 | $0.252 | Source09/07/2026 | |
| Fireworks | Via OpenRouterfireworks | $0.22 | $0.66 | Source09/07/2026 | |
| GMICloud | Via OpenRoutergmicloud/fp8 | $0.352 | $1.056 | Source09/07/2026 | |
| Inceptron | Via OpenRouterinceptron/fp4 | $0.13 | $0.28 | Source09/07/2026 | |
| Makora | Via OpenRoutermakora | $0.09 | $0.195 | Source09/07/2026 | |
| Mancer 2 | Via OpenRoutermancer/fp8 | $0.15 | $0.5 | Source09/07/2026 | |
| Morph | Via OpenRoutermorph/bf16 | $0.1234 | $0.3475 | Source09/07/2026 | |
| NextBit | Via OpenRouternextbit/fp8 | $0.4 | $1.2 | Source09/07/2026 | |
| Novita | Via OpenRouternovita/fp8 | $0.4092 | $1.2276 | Source09/07/2026 | |
| OpenInference | Via OpenRouteropen-inference/fp8 | $0.05 | $0.16 | Source09/07/2026 | |
| Parasail | Via OpenRouterparasail/fp8 | $0.14 | $0.28 | Source09/07/2026 | |
| Phala | Via OpenRouterphala | $0.44 | $1.32 | Source09/07/2026 | |
| Reka | Via OpenRouterreka/fp4 | $0.11 | $0.66 | Source09/07/2026 | |
| Relace | Via OpenRouterrelace/fp4 | Lowest listed price: $0.045 | Lowest listed price: $0.09 | Source09/07/2026 | |
| Sail Research | Via OpenRoutersail-research/fp4 | $0.065 | $0.18 | Source09/07/2026 | |
| SiliconFlow | Via OpenRoutersiliconflow/fp8 | $0.22 | $0.66 | Source09/07/2026 | |
| StreamLake | Via OpenRouterstreamlake/fp8 | $0.088 | $0.264 | Source09/07/2026 | |
| Together | Via OpenRoutertogether | $0.14 | $0.28 | Source09/07/2026 | |
| Venice | Via OpenRoutervenice | $0.175 | $0.35 | Source09/07/2026 | |
| Wafer | Via OpenRouterwafer/fast | $0.1 | $0.25 | Source09/07/2026 |
Performance
Shared benchmarks
Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.
Capability profile from matched benchmarks
Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.
Claude Fable 5
DeepSeek-V4-Flash
Coding: 100 / 95.6 (1 benchmark family)
Reasoning: 100 / 95 (1 benchmark family)
Mathematics: 100 / 93.7 (1 benchmark family)
Knowledge: 100 / 95.2 (1 benchmark family)
Finance: 100 / 95.7 (1 benchmark family)
Legal: 100 / 96.2 (1 benchmark family)
Health: 100 / 97.1 (1 benchmark family)
General: 100 / 94.5 (1 benchmark family)
29 matched rows from 1 benchmark families were considered. The radar shows 8 of 8 comparable categories.
Claude Fable 5DeepSeek-V4-Flash
LMArena Text, Style ControlOverall. Higher is better. No documented setup difference
Claude Fable 5Winner1,507.405
DeepSeek-V4-Flash1,435.816
LMArena Text, Style ControlOverall. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,507.405
DeepSeek-V4-Flash1,438.462
LMArena Text, Style ControlBusiness, management and finance. Higher is better. No documented setup difference
Claude Fable 5Winner1,501.942
DeepSeek-V4-Flash1,437.854
LMArena Text, Style ControlBusiness, management and finance. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,501.942
DeepSeek-V4-Flash1,434.968
LMArena Text, Style ControlChinese. Higher is better. No documented setup difference
Claude Fable 5Winner1,554.267
DeepSeek-V4-Flash1,472.677
LMArena Text, Style ControlChinese. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,554.267
DeepSeek-V4-Flash1,479.62
LMArena Text, Style ControlCoding. Higher is better. No documented setup difference
Claude Fable 5Winner1,551.491
DeepSeek-V4-Flash1,483.101
LMArena Text, Style ControlCoding. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,551.491
DeepSeek-V4-Flash1,479.449
LMArena Text, Style ControlCreative writing. Higher is better. No documented setup difference
Claude Fable 5Winner1,504.764
DeepSeek-V4-Flash1,408.18
LMArena Text, Style ControlCreative writing. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,504.764
DeepSeek-V4-Flash1,408.903
LMArena Text, Style ControlEnglish. Higher is better. No documented setup difference
Claude Fable 5Winner1,513.407
DeepSeek-V4-Flash1,445.287
LMArena Text, Style ControlEnglish. Higher is better. Test setup not documented as identical
Claude Fable 5Higher measured value1,513.407
DeepSeek-V4-Flash1,449.894
Key to the marks:better valuebetter, but not conclusivetie
| Benchmark and task | Claude Fable 5 | DeepSeek-V4-Flash | Source |
|---|---|---|---|
LMArena Text, Style ControlOverallTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 26,977 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 48,963 anonymous pairwise votes. | Winner1,507.405 95% confidence interval: ±4.978The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,435.816 95% confidence interval: ±4.15The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlOverallTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 26,977 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 48,705 anonymous pairwise votes. | Higher measured value1,507.405 95% confidence interval: ±4.978The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,438.462 95% confidence interval: ±4.21The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlBusiness, management and financeTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 5,567 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 9,911 anonymous pairwise votes. | Winner1,501.942 95% confidence interval: ±8.642The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,437.854 95% confidence interval: ±7.128The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlBusiness, management and financeTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 5,567 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,060 anonymous pairwise votes. | Higher measured value1,501.942 95% confidence interval: ±8.642The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,434.968 95% confidence interval: ±7.142The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlChineseTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,671 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,530 anonymous pairwise votes. | Winner1,554.267 95% confidence interval: ±15.295The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,472.677 95% confidence interval: ±12.483The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlChineseTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,671 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,509 anonymous pairwise votes. | Higher measured value1,554.267 95% confidence interval: ±15.295The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,479.62 95% confidence interval: ±12.459The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCodingTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,243 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 14,346 anonymous pairwise votes. | Winner1,551.491 95% confidence interval: ±7.795The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,483.101 95% confidence interval: ±6.376The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCodingTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,243 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 14,310 anonymous pairwise votes. | Higher measured value1,551.491 95% confidence interval: ±7.795The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,479.449 95% confidence interval: ±6.409The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCreative writingTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 5,445 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 7,972 anonymous pairwise votes. | Winner1,504.764 95% confidence interval: ±9.059The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,408.18 95% confidence interval: ±7.747The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCreative writingTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 5,445 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,029 anonymous pairwise votes. | Higher measured value1,504.764 95% confidence interval: ±9.059The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,408.903 95% confidence interval: ±7.781The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEnglishTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 11,838 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,931 anonymous pairwise votes. | Winner1,513.407 95% confidence interval: ±6.421The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,445.287 95% confidence interval: ±5.383The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEnglishTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 11,838 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,747 anonymous pairwise votes. | Higher measured value1,513.407 95% confidence interval: ±6.421The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,449.894 95% confidence interval: ±5.421The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEntertainment, sports and mediaTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 6,828 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,423 anonymous pairwise votes. | Winner1,496.204 95% confidence interval: ±8.179The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,405.349 95% confidence interval: ±7.122The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEntertainment, sports and mediaTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 6,828 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,655 anonymous pairwise votes. | Higher measured value1,496.204 95% confidence interval: ±8.179The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,406.152 95% confidence interval: ±7.06The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExcluding tiesTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 20,363 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 36,983 anonymous pairwise votes. | Winner1,527.857 95% confidence interval: ±6.475The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,431.271 95% confidence interval: ±5.416The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExcluding tiesTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 20,363 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 37,039 anonymous pairwise votes. | Higher measured value1,527.857 95% confidence interval: ±6.475The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,435.7 95% confidence interval: ±5.462The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExpert promptsTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,926 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 4,904 anonymous pairwise votes. | Winner1,548.761 95% confidence interval: ±11.468The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,458.425 95% confidence interval: ±9.147The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExpert promptsTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,926 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 4,907 anonymous pairwise votes. | Higher measured value1,548.761 95% confidence interval: ±11.468The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,467.744 95% confidence interval: ±9.211The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlFrenchTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,002 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,909 anonymous pairwise votes. | Winner1,526.877 95% confidence interval: ±20.263The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,444.246 95% confidence interval: ±15.542The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlFrenchTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,002 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,872 anonymous pairwise votes. | Higher measured value1,526.877 95% confidence interval: ±20.263The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,457.512 95% confidence interval: ±15.76The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlGermanTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 446 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 834 anonymous pairwise votes. | Winner1,491.739 95% confidence interval: ±28.29The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,423.985 95% confidence interval: ±21.432The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlGermanTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 446 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 881 anonymous pairwise votes. | Higher measured value1,491.739 95% confidence interval: ±28.29The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,434.001 95% confidence interval: ±20.992The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard promptsTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 17,731 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 32,576 anonymous pairwise votes. | Winner1,533.415 95% confidence interval: ±5.772The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,459.19 95% confidence interval: ±4.879The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard promptsTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 17,731 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 32,479 anonymous pairwise votes. | Higher measured value1,533.415 95% confidence interval: ±5.772The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,458.492 95% confidence interval: ±4.934The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard prompts, EnglishTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,856 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 15,327 anonymous pairwise votes. | Winner1,532.86 95% confidence interval: ±7.54The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,464.306 95% confidence interval: ±6.191The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard prompts, EnglishTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,856 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 15,135 anonymous pairwise votes. | Higher measured value1,532.86 95% confidence interval: ±7.54The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,465.194 95% confidence interval: ±6.261The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlInstruction followingTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 9,525 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 16,772 anonymous pairwise votes. | Winner1,511.932 95% confidence interval: ±7.102The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,428.139 95% confidence interval: ±5.955The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlInstruction followingTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 9,525 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 16,813 anonymous pairwise votes. | Higher measured value1,511.932 95% confidence interval: ±7.102The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,433.908 95% confidence interval: ±6.024The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlJapaneseTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 361 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 633 anonymous pairwise votes. | Winner1,524.432 95% confidence interval: ±32.237The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,397.389 95% confidence interval: ±25.351The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlJapaneseTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 361 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 600 anonymous pairwise votes. | Higher measured value1,524.432 95% confidence interval: ±32.237The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,422.217 95% confidence interval: ±25.99The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlKoreanTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 542 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 867 anonymous pairwise votes. | Winner1,500.566 95% confidence interval: ±27.117The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,394.225 95% confidence interval: ±21.434The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlKoreanTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 542 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 909 anonymous pairwise votes. | Higher measured value1,500.566 95% confidence interval: ±27.117The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,374.943 95% confidence interval: ±21.551The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLegal and governmentTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,227 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,892 anonymous pairwise votes. | Winner1,506.797 95% confidence interval: ±13.238The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,449.174 95% confidence interval: ±10.185The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLegal and governmentTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,227 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,872 anonymous pairwise votes. | Higher measured value1,506.797 95% confidence interval: ±13.238The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,459.091 95% confidence interval: ±10.242The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLife, physical and social scienceTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 4,321 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 7,776 anonymous pairwise votes. | Winner1,526.369 95% confidence interval: ±9.499The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,458.608 95% confidence interval: ±7.61The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLife, physical and social scienceTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 4,321 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 7,968 anonymous pairwise votes. | Higher measured value1,526.369 95% confidence interval: ±9.499The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,460.882 95% confidence interval: ±7.588The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLonger queriesTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 12,438 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,561 anonymous pairwise votes. | Winner1,522.21 95% confidence interval: ±6.615The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,448.456 95% confidence interval: ±5.733The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLonger queriesTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 12,438 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,664 anonymous pairwise votes. | Higher measured value1,522.21 95% confidence interval: ±6.615The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,449.036 95% confidence interval: ±5.731The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,320 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,516 anonymous pairwise votes. | Winner1,529.506 95% confidence interval: ±16.344The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,425.091 95% confidence interval: ±12.209The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,320 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,459 anonymous pairwise votes. | Higher measured value1,529.506 95% confidence interval: ±16.344The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,441.301 95% confidence interval: ±12.311The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathematical professionsTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,483 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,746 anonymous pairwise votes. | Winner1,517.861 95% confidence interval: ±15.778The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,431.608 95% confidence interval: ±11.935The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathematical professionsTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,483 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,607 anonymous pairwise votes. | Higher measured value1,517.861 95% confidence interval: ±15.778The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,443.348 95% confidence interval: ±12.313The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMedicine and healthcareTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,891 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,429 anonymous pairwise votes. | Winner1,502.631 95% confidence interval: ±14.403The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,459.604 95% confidence interval: ±10.945The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMedicine and healthcareTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 1,891 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,495 anonymous pairwise votes. | Higher measured value1,502.631 95% confidence interval: ±14.403The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,462.945 95% confidence interval: ±10.866The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMulti-turnTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 4,573 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,820 anonymous pairwise votes. | Winner1,514.446 95% confidence interval: ±9.496The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,452.356 95% confidence interval: ±7.462The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMulti-turnTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 4,573 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,674 anonymous pairwise votes. | Higher measured value1,514.446 95% confidence interval: ±9.496The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,445.683 95% confidence interval: ±7.508The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlNon-EnglishTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 15,138 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 27,030 anonymous pairwise votes. | Winner1,497.926 95% confidence interval: ±5.948The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,423.067 95% confidence interval: ±5.056The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlNon-EnglishTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 15,138 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 26,956 anonymous pairwise votes. | Higher measured value1,497.926 95% confidence interval: ±5.948The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,422.651 95% confidence interval: ±5.123The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlPolishTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 442 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,005 anonymous pairwise votes. | Winner1,504.423 95% confidence interval: ±26.962The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,439.462 95% confidence interval: ±18.965The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlPolishTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 442 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,014 anonymous pairwise votes. | Higher measured value1,504.423 95% confidence interval: ±26.962The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,430.358 95% confidence interval: ±18.866The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlRussianTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,690 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 5,250 anonymous pairwise votes. | Winner1,520.631 95% confidence interval: ±11.958The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,433.186 95% confidence interval: ±8.845The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlRussianTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 2,690 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 5,207 anonymous pairwise votes. | Higher measured value1,520.631 95% confidence interval: ±11.958The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,437.38 95% confidence interval: ±8.983The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSoftware and IT servicesTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 10,351 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 20,105 anonymous pairwise votes. | Winner1,540.361 95% confidence interval: ±6.751The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,471.075 95% confidence interval: ±5.634The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSoftware and IT servicesTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 10,351 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 20,031 anonymous pairwise votes. | Higher measured value1,540.361 95% confidence interval: ±6.751The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,473.269 95% confidence interval: ±5.664The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSpanishTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 886 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,548 anonymous pairwise votes. | Winner1,517.463 95% confidence interval: ±21.071The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,433.026 95% confidence interval: ±16.368The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSpanishTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 886 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,443 anonymous pairwise votes. | Higher measured value1,517.463 95% confidence interval: ±21.071The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,431.772 95% confidence interval: ±16.888The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlWriting, literature and languageTest detailsNo documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,270 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 11,742 anonymous pairwise votes. | Winner1,512.826 95% confidence interval: ±7.927The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,417.982 95% confidence interval: ±6.712The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlWriting, literature and languageTest detailsTest setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Fable 5: Snapshot: claude-fable-5, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Fable 5: Style-controlled Arena rating from 7,270 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 11,861 anonymous pairwise votes. | Higher measured value1,512.826 95% confidence interval: ±7.927The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,421.395 95% confidence interval: ±6.717The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
Key to the marks:better valuebetter, but not conclusivetie | |||
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