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Claude Opus 4.6 vs DeepSeek V4 Flash 0731

Claude Opus 4.6 leads DeepSeek V4 Flash 0731 on coding, 57.2 to 51.8 on the Vibe Coding Index, and DeepSeek V4 Flash 0731 costs 63.1x less per output token ($0.396 vs $25.00 per million). Updated October 22, 2026; 38 benchmarks have a result for both.

Replace Claude Opus 4.6 Replace DeepSeek V4 Flash 0731
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
26
DeepSeek V4 Flash 0731DeepSeek
Coding
51.8
Overall
55.2
Output $/M
$0.396
11
vs boards won of 38 shared, 1 tied

Claude Opus 4.6 or DeepSeek V4 Flash 0731: which to pick

Pick Claude Opus 4.6 for coding: it scores 57.2 on the Vibe Coding Index against 51.8 for DeepSeek V4 Flash 0731.

Pick DeepSeek V4 Flash 0731 for output tokens 63.1x cheaper ($0.396 vs $25.00 per million) and a lower cost per solved task ($0.01 against $1.56).

Model AClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved taskModel BDeepSeek V4 Flash 0731DeepSeek51.8/1004 independent benchmarks$0.01 per solved task
Shared results
38
Claude Opus 4.6 only
72
DeepSeek V4 Flash 0731 only
17
Like-for-like categories
7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.6 57.2 from 4 benchmarks, DeepSeek V4 Flash 0731 51.8 from 4 benchmarks.
Widest category
Coding, 11.5 points apart on average over 5 shared benchmarks.
Widest single gap
Design Arena: ASCII art: Claude Opus 4.6 1255 against DeepSeek V4 Flash 0731 1090, 20.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against DeepSeek V4 Flash 0731 $0.396 per million output tokens, 63.1x apart.
Context window
Claude Opus 4.6 takes 1M tokens, DeepSeek V4 Flash 0731 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.6BarsDeepSeek V4 Flash 0731Ties
Coding23
Intelligence11
Reasoning45
Math211 tie
Knowledge60
Web design80
General31
All shared boards26111 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index23
Coding benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev1547Not measuredOnly Claude Opus 4.6 measured
AA Coding IndexNot measured69.1Only DeepSeek V4 Flash 0731 measured
LiveCodeBench (Vals AI)84.7%87.3%DeepSeek V4 Flash 0731
SWE-bench Verified (Vals AI)78.2%88.8%DeepSeek V4 Flash 0731
Terminal-Bench 4 (Vals AI)Not measured18.7%Only DeepSeek V4 Flash 0731 measured
Vibe Code Bench (Vals AI)57.6%74.7%DeepSeek V4 Flash 0731
Code migration (Vals AI)Not measured38.6%Only DeepSeek V4 Flash 0731 measured
ProgramBench (Vals AI)Not measured0.0%Only DeepSeek V4 Flash 0731 measured
IOI (Vals AI)Not measured32.7%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench 2.1 (Vals AI)Not measured67.0%Only DeepSeek V4 Flash 0731 measured
SkillsBench (Vals AI)Not measured50.7%Only DeepSeek V4 Flash 0731 measured
CyberBench (Vals AI)Not measured72.1%Only DeepSeek V4 Flash 0731 measured
SciCodeNot measured50.3%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench Hard (Artificial Analysis run)48.5%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%18.8%Claude Opus 4.6
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%63.0%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured1306.1Only DeepSeek V4 Flash 0731 measured
LMArena Text: coding1534Not measuredOnly Claude Opus 4.6 measured
LMArena Text: software and IT1527Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev: React1539Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev: HTML1559Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev: from an image1543Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
AA Intelligence Index31.934.3DeepSeek V4 Flash 0731
Epoch Capabilities Index155.7154.8Claude Opus 4.6
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index18 boards, none shared
Agentic work benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
AA Agentic IndexNot measured41.0Only DeepSeek V4 Flash 0731 measured
Design Arena: agents building web apps1206Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building full-stack apps1220Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building mobile apps1207Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building Android apps1197Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building games1212Not measuredOnly Claude Opus 4.6 measured
Finance Agent (Vals AI)Not measured49.5%Only DeepSeek V4 Flash 0731 measured
Tax Agent Bench (Vals AI)Not measured28.1%Only DeepSeek V4 Flash 0731 measured
Legal Research Bench (Vals AI)Not measured30.3%Only DeepSeek V4 Flash 0731 measured
Excel Modeling Benchmark (Vals AI)Not measured57.0%Only DeepSeek V4 Flash 0731 measured
BioMysteryBench (Vals AI)Not measured64.4%Only DeepSeek V4 Flash 0731 measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only DeepSeek V4 Flash 0731 measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%Not measuredOnly Claude Opus 4.6 measured
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index45
Reasoning benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
GPQA Diamond89.7%89.9%DeepSeek V4 Flash 0731
MMMU Pro (Vals AI)83.9%Not measuredOnly Claude Opus 4.6 measured
GPQA Diamond (Artificial Analysis run)89.6%90.8%DeepSeek V4 Flash 0731
Humanity's Last Exam (Artificial Analysis run)39.9%38.6%Claude Opus 4.6
GPQA Diamond (Epoch AI run)90.5%91.0%DeepSeek V4 Flash 0731
ARC-AGI94.0%89.0%Claude Opus 4.6
ARC-AGI-269.2%61.4%Claude Opus 4.6
SimpleBench67.6%61.1%Claude Opus 4.6
Chess puzzles21.0%32.0%DeepSeek V4 Flash 0731
Mystery game puzzles25.0%34.0%DeepSeek V4 Flash 0731
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts1525Not measuredOnly Claude Opus 4.6 measured
LMArena Text: expert1544Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts in English1530Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: diagrams1340Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: homework1337Not measuredOnly Claude Opus 4.6 measured
Kagi LLM Benchmark83.6%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%94.4%Tie
FrontierMath, tiers 1 to 366.0%57.5%Claude Opus 4.6
FrontierMath, tier 426.8%24.4%Claude Opus 4.6
ProofBench50.0%56.0%DeepSeek V4 Flash 0731
LMArena Text: math1518Not measuredOnly Claude Opus 4.6 measured
LMArena Text: mathematical work1525Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
MMLU Pro89.1%86.2%Claude Opus 4.6
LegalBench (Vals AI)85.3%77.7%Claude Opus 4.6
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%61.9%Claude Opus 4.6
TaxEval (Vals AI)76.0%70.7%Claude Opus 4.6
MortgageTax (Vals AI)68.5%Not measuredOnly Claude Opus 4.6 measured
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%41.4%Claude Opus 4.6
SimpleQA Verified47.0%33.6%Claude Opus 4.6
LMArena Text: science1519Not measuredOnly Claude Opus 4.6 measured
LMArena Text: medicine and healthcare1504Not measuredOnly Claude Opus 4.6 measured
LMArena Text: legal and government1512Not measuredOnly Claude Opus 4.6 measured
LMArena Text: business and finance1497Not measuredOnly Claude Opus 4.6 measured
FACTS Benchmark Suite41.5%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
Design Arena: websites12911237Claude Opus 4.6
Design Arena: UI components12811233Claude Opus 4.6
Design Arena: game dev12771207Claude Opus 4.6
Design Arena: data viz12791180Claude Opus 4.6
Design Arena: 3D12731208Claude Opus 4.6
Design Arena: all code categories12881229Claude Opus 4.6
Design Arena: SVG12271184Claude Opus 4.6
Design Arena: ASCII art12551090Claude Opus 4.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index31
General benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
SAGE (Vals AI)51.6%Not measuredOnly Claude Opus 4.6 measured
MedScribe (Vals AI)86.7%80.4%Claude Opus 4.6
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%79.7%DeepSeek V4 Flash 0731
DTBench91.2%90.9%Claude Opus 4.6
LMCA55.8%41.7%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.6 measured
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text1501Not measuredOnly Claude Opus 4.6 measured
LMArena Text: instruction following1521Not measuredOnly Claude Opus 4.6 measured
LMArena Text: creative writing1505Not measuredOnly Claude Opus 4.6 measured
LMArena Vision1316Not measuredOnly Claude Opus 4.6 measured
LMArena Text: English1511Not measuredOnly Claude Opus 4.6 measured
LMArena Text: non-English1488Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Chinese1551Not measuredOnly Claude Opus 4.6 measured
LMArena Text: German1500Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Japanese1488Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Korean1464Not measuredOnly Claude Opus 4.6 measured
LMArena Text: French1512Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Spanish1510Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Russian1497Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Polish1499Not measuredOnly Claude Opus 4.6 measured
LMArena Text: multi-turn1511Not measuredOnly Claude Opus 4.6 measured
LMArena Text: longer queries1518Not measuredOnly Claude Opus 4.6 measured
LMArena Text: writing and language1502Not measuredOnly Claude Opus 4.6 measured
LMArena Text: entertainment and media1492Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: English1324Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: Chinese1370Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: reading text1326Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: humor1314Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing1331Not measuredOnly Claude Opus 4.6 measured
LMArena Document1507Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and DeepSeek V4 Flash 0731
BenchmarkClaude Opus 4.6DeepSeek V4 Flash 0731Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.6$0.018Fits in one request
DeepSeek V4 Flash 0731$0.0003Fits in one request

DeepSeek V4 Flash 0731 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
DeepSeek V4 Flash 0731$0.0082Fits in one request

DeepSeek V4 Flash 0731 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
DeepSeek V4 Flash 0731$0.032Fits in one request

DeepSeek V4 Flash 0731 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.6 and DeepSeek V4 Flash 0731
SpecificationAnthropic Claude Opus 4.6DeepSeek V4 Flash 0731
MakerAnthropicDeepSeek
WeightsNo public weights listedOpen weights
ReleasedFebruary 4, 2026July 31, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.14
Output $/Mtok$25.00$0.396
Coding index57.251.8
Independent measurements behind it44
Cost per solved task$1.56$0.01
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than DeepSeek V4 Flash 0731 for coding?

Pick Claude Opus 4.6 for coding: it scores 57.2 on the Vibe Coding Index against 51.8 for DeepSeek V4 Flash 0731. Pick DeepSeek V4 Flash 0731 for output tokens 63.1x cheaper ($0.396 vs $25.00 per million) and a lower cost per solved task ($0.01 against $1.56).

Which is cheaper, Claude Opus 4.6 or DeepSeek V4 Flash 0731?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; DeepSeek V4 Flash 0731 costs $0.14 and $0.396. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and DeepSeek V4 Flash 0731 $0.01.

Which has the bigger context window, Claude Opus 4.6 or DeepSeek V4 Flash 0731?

DeepSeek V4 Flash 0731, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 4.6 vs DeepSeek V4 Flash 0731 comparison based on?

38 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.6's coding index rests on 4 independent benchmarks and DeepSeek V4 Flash 0731's on 4. Where only one model has a result, the page says so instead of naming a winner.

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