Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.
shared result series
33
distinct benchmarks
4
latest retrieval
2026-09-29
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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.
Specifications for Claude Opus 5 and DeepSeek-V4-Flash
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.
API pricing for Claude Opus 5 and DeepSeek-V4-Flash
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.
Provider pricing for Claude Opus 5 and DeepSeek-V4-Flash
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 Opus 5
DeepSeek-V4-Flash
Coding: 100 / 96.5 (1 benchmark family)
Reasoning: 100 / 96 (1 benchmark family)
Mathematics: 100 / 94.4 (1 benchmark family)
Knowledge: 100 / 96.2 (1 benchmark family)
Finance: 100 / 96.5 (1 benchmark family)
Legal: 100 / 96.9 (1 benchmark family)
Cybersecurity: 50 / 94.5 (1 benchmark family)
Health: 100 / 97.1 (1 benchmark family)
32 matched rows from 3 benchmark families were considered. The radar shows 8 of 9 comparable categories.
Claude Opus 5DeepSeek-V4-Flash
AlmanBench v0.1Accepted cases. Higher is better. No documented setup difference
Claude Opus 5Winner94.947 %
DeepSeek-V4-Flash93.003 %
CyberBench v1.1Patch. Higher is better. No documented setup difference
Claude Opus 5Winner81.356 %
DeepSeek-V4-Flash72.414 %
LMArena Text, Style ControlOverall. Higher is better. No documented setup difference
Claude Opus 5Winner1,491.077
DeepSeek-V4-Flash1,438.511
Taste-BenchOverall. Higher is better. Test setup not documented as identical
Claude Opus 5Higher measured value55.5 %
DeepSeek-V4-Flash43.3 %
CyberBench v1.1PoC. Higher is better. No documented setup difference
Claude Opus 50 %
DeepSeek-V4-FlashWinner61.017 %
LMArena Text, Style ControlBusiness, management and finance. Higher is better. No documented setup difference
Claude Opus 5Winner1,486.354
DeepSeek-V4-Flash1,434.189
LMArena Text, Style ControlChinese. Higher is better. No documented setup difference
Claude Opus 5Winner1,550.221
DeepSeek-V4-Flash1,479.924
LMArena Text, Style ControlCoding. Higher is better. No documented setup difference
Claude Opus 5Winner1,533.103
DeepSeek-V4-Flash1,479.555
LMArena Text, Style ControlCreative writing. Higher is better. No documented setup difference
Claude Opus 5Winner1,472.38
DeepSeek-V4-Flash1,410.703
LMArena Text, Style ControlEnglish. Higher is better. No documented setup difference
Claude Opus 5Winner1,492.91
DeepSeek-V4-Flash1,449.94
LMArena Text, Style ControlEntertainment, sports and media. Higher is better. No documented setup difference
Claude Opus 5Winner1,463.788
DeepSeek-V4-Flash1,408.063
LMArena Text, Style ControlExcluding ties. Higher is better. No documented setup difference
Claude Opus 5Winner1,506.215
DeepSeek-V4-Flash1,436.008
Key to the marks:better valuebetter, but not conclusivetie
Benchmark scores for Claude Opus 5 and DeepSeek-V4-Flash
Benchmark and task
Claude Opus 5
DeepSeek-V4-Flash
Source
AlmanBench v0.1Accepted casesTest details
No documented difference in the test setupVersion: v0.1, results commit f34ddbfMetric: accepted casesScoring: Higher is betterSettings: Reasoning: max1,029 public tasks with one direct run per row. The target is the Alman language specification.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 55,063 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 51,747 anonymous pairwise votes.
Winner1,491.077
95% confidence interval: ±3.89The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,438.511
95% confidence interval: ±4.115The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
Test setup not documented as identicalNo direct winnerVersion: arxiv:2609.25804v2Metric: both-orders-correct, engineering/research macro averageScoring: Higher is betterClaude Opus 5: Reasoning: default, Output limit: 65,536 tokens, Attempts: 502 questions, two option orders each DeepSeek-V4-Flash: Reasoning: max, Output limit: 65,536 tokens, Attempts: 502 questions, two option orders eachSame prompt for all models. Each of 502 questions is shown twice with the options reversed. Average of engineering and research success rates, requiring both orders to be correct. 65,536-token output budget; unparseable answers count as wrong.
Higher measured value55.5 %
0 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
43.3 %
2 of 1,004 responses were unparseable and counted as wrong. Not a Gradually test.
LMArena Text, Style ControlBusiness, management and financeTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 10,655 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,641 anonymous pairwise votes.
Winner1,486.354
95% confidence interval: ±7.021The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,434.189
95% confidence interval: ±6.982The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 4,449 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,992 anonymous pairwise votes.
Winner1,550.221
95% confidence interval: ±10.016The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,479.924
95% confidence interval: ±11.42The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 14,606 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 15,239 anonymous pairwise votes.
Winner1,533.103
95% confidence interval: ±6.443The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,479.555
95% confidence interval: ±6.265The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 11,902 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,638 anonymous pairwise votes.
Winner1,472.38
95% confidence interval: ±7.079The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,410.703
95% confidence interval: ±7.575The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 22,227 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 22,908 anonymous pairwise votes.
Winner1,492.91
95% confidence interval: ±5.473The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,449.94
95% confidence interval: ±5.323The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlEntertainment, sports and mediaTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 14,344 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 11,428 anonymous pairwise votes.
Winner1,463.788
95% confidence interval: ±6.602The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,408.063
95% confidence interval: ±6.896The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 41,621 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 39,391 anonymous pairwise votes.
Winner1,506.215
95% confidence interval: ±5.252The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,436.008
95% confidence interval: ±5.353The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 6,288 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 5,311 anonymous pairwise votes.
Winner1,542.577
95% confidence interval: ±8.709The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,466.306
95% confidence interval: ±8.867The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 1,646 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,966 anonymous pairwise votes.
Winner1,508.513
95% confidence interval: ±16.539The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,459.263
95% confidence interval: ±15.286The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 856 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 906 anonymous pairwise votes.
Winner1,488.543
95% confidence interval: ±21.505The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,433.595
95% confidence interval: ±20.539The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 36,504 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 34,700 anonymous pairwise votes.
Winner1,516.434
95% confidence interval: ±4.744The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,458.083
95% confidence interval: ±4.832The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 14,629 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 16,039 anonymous pairwise votes.
Winner1,513.898
95% confidence interval: ±6.312The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,464.61
95% confidence interval: ±6.133The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 19,769 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 18,051 anonymous pairwise votes.
Winner1,497.062
95% confidence interval: ±5.883The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,433.413
95% confidence interval: ±5.881The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 886 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 635 anonymous pairwise votes.
Winner1,503.479
95% confidence interval: ±23.102The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,424.242
95% confidence interval: ±25.166The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 1,049 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 951 anonymous pairwise votes.
Winner1,492.239
95% confidence interval: ±20.406The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,378.153
95% confidence interval: ±20.872The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlLegal and governmentTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 4,687 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 4,107 anonymous pairwise votes.
Winner1,504.808
95% confidence interval: ±9.735The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,457.491
95% confidence interval: ±9.927The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlLife, physical and social scienceTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 9,474 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,509 anonymous pairwise votes.
Winner1,512.917
95% confidence interval: ±7.285The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,459.724
95% confidence interval: ±7.418The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 26,392 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 23,501 anonymous pairwise votes.
Winner1,505.391
95% confidence interval: ±5.562The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,448.636
95% confidence interval: ±5.577The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 2,530 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,619 anonymous pairwise votes.
Winner1,522.874
95% confidence interval: ±12.549The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,441.412
95% confidence interval: ±11.893The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 3,068 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,828 anonymous pairwise votes.
Winner1,534.627
95% confidence interval: ±11.773The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,445.003
95% confidence interval: ±11.761The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlMedicine and healthcareTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 4,176 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,774 anonymous pairwise votes.
Winner1,504.76
95% confidence interval: ±10.164The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,461.307
95% confidence interval: ±10.453The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 8,697 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 9,233 anonymous pairwise votes.
Winner1,484.158
95% confidence interval: ±7.493The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,446.332
95% confidence interval: ±7.34The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 32,822 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 28,837 anonymous pairwise votes.
Winner1,483.074
95% confidence interval: ±4.863The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,423.125
95% confidence interval: ±5.023The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 802 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,037 anonymous pairwise votes.
Winner1,499.971
95% confidence interval: ±21.594The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,434.977
95% confidence interval: ±18.457The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 6,531 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 5,790 anonymous pairwise votes.
Winner1,498.054
95% confidence interval: ±8.321The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,437.327
95% confidence interval: ±8.593The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlSoftware and IT servicesTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 20,945 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,329 anonymous pairwise votes.
Winner1,524.03
95% confidence interval: ±5.729The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,472.722
95% confidence interval: ±5.539The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 1,572 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,497 anonymous pairwise votes.
Winner1,473.507
95% confidence interval: ±16.268The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,429.802
95% confidence interval: ±16.45The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena Text, Style ControlWriting, literature and languageTest details
No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Opus 5: Snapshot: claude-opus-5-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlClaude Opus 5: Style-controlled Arena rating from 15,394 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 12,763 anonymous pairwise votes.
Winner1,482.347
95% confidence interval: ±6.381The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,422.277
95% confidence interval: ±6.549The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
Key to the marks:better valuebetter, but not conclusivetie
Our model tests
Our tests
Compare how the models respond to the same prompt. Each test shows the first attempt, with no subsequent fixes to the generated code. These results do not contribute to an overall score.
Pelican on a bicycle
A community classic for free-form SVG drawing.
Claude Opus 5
The API response was not fully received. The model was not evaluated.
Reasoning (requested): high
First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
anthropic/claude-opus-5
Reasoning setting
high
Pinned endpoint
Anthropic | anthropic/claude-opus-5-20260723
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Failed
Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.
DeepSeek-V4-Flash
API access was unavailable for this run. The model was not evaluated.
Reasoning (requested): high
First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
deepseek/deepseek-v4-flash-0731
Reasoning setting
high
Pinned endpoint
DeepSeek | deepseek/deepseek-v4-flash-20260731
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Not run
Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.
Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.
The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.
Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.
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