LogoLMSpeed
Back to models

Model compare

Claude Opus 4.6 vs DeepSeek V4 Flash

The readout for Claude Opus 4.6 and DeepSeek V4 Flash, before the detailed comparison sheet.

Model A

Claude Opus 4.6

Anthropic

Leading
vs

Model B

DeepSeek V4 Flash

DeepSeek

Contender

Key Takeaways

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Claude Opus 4.6

Claude Opus 4.6 has the higher weighted result; Model A / B score 88 to 12.

Evidence depth

103 data points

Includes 19 benchmark rows, 0 audit samples, and 9 provider examples.

Selection signal

Start with Claude Opus 4.6

The charts below split 28 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Claude Opus 4.6 and DeepSeek V4 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Opus 4.6
DeepSeek V4 Flash
Overall leaderLeadingContender
Weighted overall score88.0 pts12.0 pts
Benchmark category leads5 categories0 categories
Operational advantagesFirst-token latency, Provider coverageCheapest input price, Average speed, Free providers
Context window1M tokens1.0M tokens
Max output128K tokens384K tokens
Modalities

Input

TextImageFile

Output

Text

Input

Text

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Claude Opus 4.6
DeepSeek V4 Flash
DeveloperAnthropicDeepSeek
ReleasedFeb 2026Apr 2026
ParametersNo dataNo data
TokenizerClaudeDeepSeek
Knowledge cutoffNo dataNo data
OpenRouter IDanthropic/claude-opus-4.6deepseek/deepseek-v4-flash
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Opus 4.6 and DeepSeek V4 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Opus 4.6

Claude Opus 4.6 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Provider coverage).

DeepSeek V4 Flash

DeepSeek V4 Flash has these operational advantages: Cheapest input price, Average speed, Free providers.

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
8 / 8
Model B coverage
5 / 8
Shared
5 shared categories

Avg. score

Claude Opus 4.6

51.8

Avg. score

DeepSeek V4 Flash

43.3

Agents

Claude Opus 4.6 leads by 8.9

Claude Opus 4.654.3
DeepSeek V4 Flash45.4

Coding

Claude Opus 4.6 leads by 12.7

Claude Opus 4.656.6
DeepSeek V4 Flash43.9

Reasoning

Claude Opus 4.6 leads by 0.1

Claude Opus 4.653.4
DeepSeek V4 Flash53.3

Knowledge

Claude Opus 4.6 leads by 11.9

Claude Opus 4.653.3
DeepSeek V4 Flash41.4

Math

Claude Opus 4.6 leads by 23.1

Claude Opus 4.655.7
DeepSeek V4 Flash32.6

Multilingual

Claude Opus 4.6

Claude Opus 4.648.4
DeepSeek V4 Flash-

Multimodal

Claude Opus 4.6

Claude Opus 4.647.8
DeepSeek V4 Flash-

Instruction following

Claude Opus 4.6

Claude Opus 4.644.8
DeepSeek V4 Flash-

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

62.0

Rank #41/111 · confidence 4 · eval date 2026-02-01

+11.0

DeepSeek V4 Flash

51.0

Rank #78/111 · confidence 2 · eval date 2026-07-31

Pricingverified

Output price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$25.00/M

Rank #169/186 · confidence 4

+$24.72/M

DeepSeek V4 Flash

winner

$0.280/M

Rank #10/186 · confidence 4

Pricingverified

Blended price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$10.00/M

Rank #169/186 · confidence 4

+$9.83/M

DeepSeek V4 Flash

winner

$0.168/M

Rank #13/186 · confidence 4

Pricingverified

Input price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$5.00/M

Rank #168/186 · confidence 4

+$4.87/M

DeepSeek V4 Flash

winner

$0.130/M

Rank #18/186 · confidence 4

Reasoningreported

MMLU-Pro

SourceClaude Opus 4.6

Claude Opus 4.6

82.0%

Rank #50/129 · confidence 4 · eval date 2026-02-01

+4.4%

DeepSeek V4 Flash

winner

86.4%

Rank #17/129 · confidence 2 · eval date 2026-07-31

Reasoningverified

HLE

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

19.1%

Rank #89/216 · confidence 4

+11.2%

DeepSeek V4 Flash

winner

30.3%

Rank #55/216 · confidence 4

Reasoningverified

GPQA

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

84.0%

Rank #75/218 · confidence 4

+2.7%

DeepSeek V4 Flash

winner

86.7%

Rank #56/218 · confidence 4

Codingreported

SWE-bench Verified

SourceClaude Opus 4.6

Claude Opus 4.6

winner

80.8

Rank #8/49 · confidence 4 · eval date 2026-02-01

+2.2

DeepSeek V4 Flash

78.6

Rank #19/49 · confidence 2 · eval date 2026-07-31

Codingreported

SWE-bench Pro

SourceClaude Opus 4.6

Claude Opus 4.6

winner

53.4

Rank #41/50 · confidence 4 · eval date 2026-02-01

+1.1

DeepSeek V4 Flash

52.3

Rank #43/50 · confidence 2 · eval date 2026-07-31

Codingreported

BenchLM Coding score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

50.3

Rank #54/87 · confidence 4 · eval date 2026-02-01

+4.3

DeepSeek V4 Flash

46.0

Rank #65/87 · confidence 2 · eval date 2026-07-31

Mathreported

BenchLM Math score

SourceClaude Opus 4.6

Claude Opus 4.6

58.6

Rank #29/63 · confidence 4 · eval date 2026-02-01

+19.8

DeepSeek V4 Flash

winner

78.4

Rank #11/63 · confidence 2 · eval date 2026-07-31

Knowledgereported

BenchLM Knowledge score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

79.8

Rank #15/83 · confidence 4 · eval date 2026-02-01

+27.0

DeepSeek V4 Flash

52.8

Rank #69/83 · confidence 2 · eval date 2026-07-31

Knowledgereported

GPQA-D

SourceClaude Opus 4.6

Claude Opus 4.6

winner

89.2

Rank #19/32 · confidence 4 · eval date 2026-02-01

+1.8

DeepSeek V4 Flash

87.4

Rank #26/32 · confidence 2 · eval date 2026-07-31

Multimodalreported

Design Arena Website

SourceClaude Opus 4.6

Claude Opus 4.6

winner

1306.0

Rank #14/78 · confidence 4 · eval date 2026-02-01

+76.0

DeepSeek V4 Flash

1230.0

Rank #43/78 · confidence 2 · eval date 2026-07-31

Agentsreported

Claw-Eval

SourceClaude Opus 4.6

Claude Opus 4.6

winner

70.4

Rank #3/27 · confidence 4 · eval date 2026-02-01

+12.6

DeepSeek V4 Flash

57.8

Rank #16/27 · confidence 2 · eval date 2026-07-31

Agentsreported

Gert Labs

SourceClaude Opus 4.6

Claude Opus 4.6

winner

61.9

Rank #10/49 · confidence 4 · eval date 2026-02-01

+7.5

DeepSeek V4 Flash

54.4

Rank #18/49 · confidence 2 · eval date 2026-07-31

Agentsreported

BrowseComp

SourceClaude Opus 4.6

Claude Opus 4.6

winner

83.7

Rank #11/32 · confidence 4 · eval date 2026-02-01

+30.2

DeepSeek V4 Flash

53.5

Rank #31/32 · confidence 2 · eval date 2026-07-31

Agentsreported

Terminal-Bench 2.0

SourceClaude Opus 4.6

Claude Opus 4.6

winner

65.4

Rank #24/53 · confidence 4 · eval date 2026-02-01

+8.8

DeepSeek V4 Flash

56.6

Rank #38/53 · confidence 2 · eval date 2026-07-31

Agentsreported

BenchLM Agentic score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

63.5

Rank #36/76 · confidence 4 · eval date 2026-02-01

+28.9

DeepSeek V4 Flash

34.6

Rank #64/76 · confidence 2 · eval date 2026-07-31

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Claude Opus 4.6
DeepSeek V4 Flash
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Claude Opus 4.6
DeepSeek V4 Flash
OpenCode210 tests

Claude Opus 4.6

speed / latency

N/A / N/A

input / output

No data

DeepSeek V4 Flash

speed / latency

81 tok/s / 12508ms

input / output

No data

Jasper45 tests

Claude Opus 4.6

claude-opus-4-6

speed / latency

N/A / N/A

input / output

$0.500/M/$2.50/M

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

96 tok/s / 7428ms

input / output

$0/M/$0/M

小水管 API25 tests

Claude Opus 4.6

speed / latency

45 tok/s / 6167ms

input / output

No data

DeepSeek V4 Flash

speed / latency

83 tok/s / 5114ms

input / output

No data

钠 API25 tests

Claude Opus 4.6

speed / latency

42 tok/s / 2282ms

input / output

No data

DeepSeek V4 Flash

speed / latency

85 tok/s / 6387ms

input / output

No data

Rnglg2 API15 tests

Claude Opus 4.6

speed / latency

57 tok/s / 3926ms

input / output

No data

DeepSeek V4 Flash

speed / latency

N/A / N/A

input / output

No data

BUZZ

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.169/M/$0.844/M

DeepSeek V4 Flash

deepseek-v4-flash-free

speed / latency

No data

input / output

$0/M/$0/M

Dext API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.240/M/$1.20/M

DeepSeek V4 Flash

deepseek-v4-flash

speed / latency

No data

input / output

$0/M/$0/M

S3AI API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.773/M/$3.87/M

DeepSeek V4 Flash

deepseek-v4-flash-0731-free

speed / latency

No data

input / output

$0/request

Zero API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.342/M/$1.71/M

DeepSeek V4 Flash

deepseek-v4-flash-0731

speed / latency

No data

input / output

$0/M/$0/M

FAQ

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.