Head-to-head comparison

Gemini 3.5 Flash 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: 32
distinct benchmarks: 2
latest retrieval: 2026-09-04

First modelSecond model

Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for Gemini 3.5 Flash and DeepSeek-V4-Flash
Attribute	Gemini 3.5 Flash	DeepSeek-V4-Flash
Provider	Google	DeepSeek
Released	May 19, 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	1,048,576 tokens	1,000,000 tokens
Knowledge cutoff	Not published	Not published
Technical sources	Model	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.

API pricing for Gemini 3.5 Flash and DeepSeek-V4-Flash
Price type	Gemini 3.5 Flash	DeepSeek-V4-Flash
API input	$1.5	$0.14
API output	$9	$0.28
Cache read	$0.15	$0.
Cache write (5 min.)	Not listed	Not listed
Cache write (1 hr.)	Not listed	Not listed
Price verified	07/30/2026 Source	07/30/2026 Source

Gemini 3.5 FlashDeepSeek-V4-Flash

API inputUSD per 1M tokens, base tier

Gemini 3.5 Flash$1.5

DeepSeek-V4-Flash$0.14

API outputUSD per 1M tokens, base tier

Gemini 3.5 Flash$9

DeepSeek-V4-Flash$0.28

Cache readUSD per 1M tokens, base tier

Gemini 3.5 Flash$0.15

DeepSeek-V4-Flash$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.

Provider pricing for Gemini 3.5 Flash and DeepSeek-V4-Flash
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
Gemini 3.5 Flash	Google	Direct from developerStandard API	$1.5	$9	Source07/30/2026
	Google	Via OpenRoutergoogle-vertex/global	$1.5	$9	Source09/07/2026
	Google	Via OpenRoutergoogle-vertex/global/flex	Lowest listed price: $0.75	Lowest listed price: $4.5	Source09/07/2026
	Google	Via OpenRoutergoogle-vertex/global/priority	$2.7	$16.2	Source09/07/2026
	Google	Via OpenRoutergoogle-vertex/us	$1.65	$9.9	Source09/07/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio	$1.5	$9	Source09/07/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio/flex	Lowest listed price: $0.75	Lowest listed price: $4.5	Source09/07/2026
	Google AI Studio	Via OpenRoutergoogle-ai-studio/priority	$2.7	$16.2	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.

Gemini 3.5 Flash

DeepSeek-V4-Flash

Coding: 100 / 98.1 (1 benchmark family)

Reasoning: 100 / 98 (1 benchmark family)

Mathematics: 100 / 96.5 (1 benchmark family)

Knowledge: 100 / 97.7 (1 benchmark family)

Finance: 100 / 97.9 (1 benchmark family)

Legal: 100 / 99 (1 benchmark family)

Cybersecurity: 98.1 / 95.2 (1 benchmark family)

Health: 100 / 98 (1 benchmark family)

32 matched rows from 2 benchmark families were considered. The radar shows 8 of 9 comparable categories.

Gemini 3.5 FlashDeepSeek-V4-Flash

CyberBenchOverall. Higher is better. No documented setup difference

Gemini 3.5 Flash69.331 %

DeepSeek-V4-Flash66.716 %

LMArena Text, Style ControlOverall. Higher is better. No documented setup difference

Gemini 3.5 Flash1,479.148

DeepSeek-V4-Flash1,438.462

CyberBenchPatch. Higher is better. No documented setup difference

Gemini 3.5 Flash81.034 %

DeepSeek-V4-Flash72.414 %

LMArena Text, Style ControlBusiness, management and finance. Higher is better. No documented setup difference

Gemini 3.5 Flash1,465.666

DeepSeek-V4-Flash1,434.968

CyberBenchPoC. Higher is better. No documented setup difference

Gemini 3.5 Flash57.627 %

DeepSeek-V4-Flash61.017 %

LMArena Text, Style ControlChinese. Higher is better. No documented setup difference

Gemini 3.5 Flash1,523.785

DeepSeek-V4-Flash1,479.62

LMArena Text, Style ControlCoding. Higher is better. No documented setup difference

Gemini 3.5 Flash1,507.896

DeepSeek-V4-Flash1,479.449

LMArena Text, Style ControlCreative writing. Higher is better. No documented setup difference

Gemini 3.5 Flash1,464.209

DeepSeek-V4-Flash1,408.903

LMArena Text, Style ControlEnglish. Higher is better. No documented setup difference

Gemini 3.5 Flash1,477.601

DeepSeek-V4-Flash1,449.894

LMArena Text, Style ControlEntertainment, sports and media. Higher is better. No documented setup difference

Gemini 3.5 Flash1,455.503

DeepSeek-V4-Flash1,406.152

LMArena Text, Style ControlExcluding ties. Higher is better. No documented setup difference

Gemini 3.5 Flash1,489.285

DeepSeek-V4-Flash1,435.7

LMArena Text, Style ControlExpert prompts. Higher is better. No documented setup difference

Gemini 3.5 Flash1,491.166

DeepSeek-V4-Flash1,467.744

Key to the marks:better valuebetter, but not conclusivetie

How to read this comparison

Winning one benchmark is not an overall verdict

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.

More matchups

Compare Gemini 3.5 Flash and DeepSeek-V4-Flash with other leading models using the same data and benchmark logic.

View the complete LLM comparison

Benchmark scores for Gemini 3.5 Flash and DeepSeek-V4-Flash
Benchmark and task	Gemini 3.5 Flash	DeepSeek-V4-Flash	Source
CyberBenchOverall Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better	Winner69.331 %	66.716 %	Vals AI Source details Data as of: 09/01/2026
LMArena Text, Style ControlOverall Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 33,874 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 48,705 anonymous pairwise votes.	Winner1,479.148 95% confidence interval: ±4.345The 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.	LMArena Source details Data as of: 09/01/2026
CyberBenchPatch Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better	Winner81.034 %	72.414 %	Vals AI Source details Data as of: 08/03/2026
LMArena Text, Style ControlBusiness, management and finance Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 6,750 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,060 anonymous pairwise votes.	Winner1,465.666 95% confidence interval: ±7.938The 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.	LMArena Source details Data as of: 09/01/2026
CyberBenchPoC Test details No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better	57.627 %	Winner61.017 %	Vals AI Source details Data as of: 08/03/2026
LMArena Text, Style ControlChinese Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 2,185 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,509 anonymous pairwise votes.	Winner1,523.785 95% confidence interval: ±13.691The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlCoding Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 9,858 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 14,310 anonymous pairwise votes.	Winner1,507.896 95% confidence interval: ±6.918The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlCreative writing Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 6,261 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,029 anonymous pairwise votes.	Winner1,464.209 95% confidence interval: ±8.449The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlEnglish Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 14,760 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,747 anonymous pairwise votes.	Winner1,477.601 95% confidence interval: ±5.811The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlEntertainment, sports and media Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 8,008 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 10,655 anonymous pairwise votes.	Winner1,455.503 95% confidence interval: ±7.604The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlExcluding ties Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 25,685 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 37,039 anonymous pairwise votes.	Winner1,489.285 95% confidence interval: ±5.708The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlExpert prompts Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 3,765 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 4,907 anonymous pairwise votes.	Winner1,491.166 95% confidence interval: ±10.263The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlFrench Test details No documented difference in the test setupNo clear leadVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 1,143 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,872 anonymous pairwise votes.	No clear lead1,482.891 95% confidence interval: ±19.135The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlGerman Test details No documented difference in the test setupNo clear leadVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 554 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 881 anonymous pairwise votes.	No clear lead1,472.702 95% confidence interval: ±25.747The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlHard prompts Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 22,707 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 32,479 anonymous pairwise votes.	Winner1,497.725 95% confidence interval: ±5.13The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlHard prompts, English Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 9,989 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 15,135 anonymous pairwise votes.	Winner1,491.638 95% confidence interval: ±6.84The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlInstruction following Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 12,015 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 16,813 anonymous pairwise votes.	Winner1,466.61 95% confidence interval: ±6.374The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlJapanese Test details No documented difference in the test setupNo clear leadVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 447 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 600 anonymous pairwise votes.	No clear lead1,470.514 95% confidence interval: ±28.846The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlKorean Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 707 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 909 anonymous pairwise votes.	Winner1,442.218 95% confidence interval: ±22.67The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlLegal and government Test details No documented difference in the test setupNo clear leadVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 2,816 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,872 anonymous pairwise votes.	No clear lead1,473.514 95% confidence interval: ±11.897The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlLife, physical and social science Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 5,533 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 7,968 anonymous pairwise votes.	Winner1,488.436 95% confidence interval: ±8.49The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlLonger queries Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 15,749 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 21,664 anonymous pairwise votes.	Winner1,482.425 95% confidence interval: ±6.06The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlMath Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 1,638 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,459 anonymous pairwise votes.	Winner1,504.032 95% confidence interval: ±14.9The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlMathematical professions Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 1,911 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 2,607 anonymous pairwise votes.	Winner1,485.634 95% confidence interval: ±14.143The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlMedicine and healthcare Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 2,508 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 3,495 anonymous pairwise votes.	Winner1,492.702 95% confidence interval: ±12.721The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlMulti-turn Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 5,775 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 8,674 anonymous pairwise votes.	Winner1,485.062 95% confidence interval: ±8.535The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlNon-English Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 19,113 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 26,956 anonymous pairwise votes.	Winner1,472.208 95% confidence interval: ±5.341The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlPolish Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 616 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,014 anonymous pairwise votes.	Winner1,511.042 95% confidence interval: ±24.474The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlRussian Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 3,509 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 5,207 anonymous pairwise votes.	Winner1,490.286 95% confidence interval: ±10.554The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlSoftware and IT services Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 13,719 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 20,031 anonymous pairwise votes.	Winner1,501.285 95% confidence interval: ±6.083The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlSpanish Test details No documented difference in the test setupNo clear leadVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 1,041 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 1,443 anonymous pairwise votes.	No clear lead1,465.869 95% confidence interval: ±19.365The 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.	LMArena Source details Data as of: 09/01/2026
LMArena Text, Style ControlWriting, literature and language Test details No documented difference in the test setupVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterGemini 3.5 Flash: Snapshot: gemini-3.5-flash-high, Reasoning: high, Harness: Arena text, style control DeepSeek-V4-Flash: Snapshot: deepseek-v4-flash-high-preview, Reasoning: high, Harness: Arena text, style controlGemini 3.5 Flash: Style-controlled Arena rating from 8,587 anonymous pairwise votes.DeepSeek-V4-Flash: Style-controlled Arena rating from 11,861 anonymous pairwise votes.	Winner1,475.15 95% confidence interval: ±7.28The 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.	LMArena Source details Data as of: 09/01/2026
Key to the marks:better valuebetter, but not conclusivetie