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Claude Opus 4.6 vs Kimi K3

Updated October 21, 2026. 80 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.6 Replace Kimi K3
Claude Opus 4.6Anthropic
Coding
66.9
Overall
31.9
Output $/M
$25.00
34
Kimi K3Moonshot AI
Coding
61.8
Overall
43.6
Output $/M
$11.936
45
vs boards won of 80 shared, 1 tied

Decision reading

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 61.8 for Kimi K3.

Pick Kimi K3 when output tokens cost 2.1x less, or when a solved task costs $0.81 against $1.56.

Model AClaude Opus 4.6Anthropic66.9/1002 independent benchmarks$1.56 per solved taskModel BKimi K3Moonshot AI61.8/1002 independent benchmarks$0.81 per solved task
Shared results
80
Claude Opus 4.6 only
28
Kimi K3 only
37
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 66.9 from 2 benchmarks, Kimi K3 61.8 from 2 benchmarks.
Widest category
Math, 10.9 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 4.6 50.0% against Kimi K3 87.0%, 37.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Kimi K3 $11.936 per million output tokens, 2.1x apart.
Context window
Claude Opus 4.6 takes 1M tokens, Kimi K3 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 4.6BarsKimi K3Ties
Coding29
Intelligence02
Agentic work16
Reasoning58
Math24
Knowledge74
Web design07
General1751 tie
All shared boards34451 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index29
Coding benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDev15471655Kimi K3
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)84.7%87.2%Kimi K3
SWE-bench Verified (Vals AI)78.2%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)57.6%85.0%Kimi K3
Code migration (Vals AI)Not measured16.1%Only Kimi K3 measured
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)Not measured80.9%Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCodeNot measured59.5%Only Kimi K3 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%44.2%Kimi K3
FrontierSWENot measured25.9%Only Kimi K3 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%82.6%Kimi K3
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured1524.5Only Kimi K3 measured
LMArena Text: coding15341508Claude Opus 4.6
LMArena Text: software and IT15271499Claude Opus 4.6
LMArena WebDev: React15391670Kimi K3
LMArena WebDev: HTML15591644Kimi K3
LMArena WebDev: from an image15431579Kimi K3
Neither model has a result on the other 8 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
AA Intelligence Index31.943.6Kimi K3
Epoch Capabilities Index155.7157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index16
Agentic work benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web apps12061296Kimi K3
Design Arena: agents building full-stack apps12201315Kimi K3
Design Arena: agents building mobile apps12071267Kimi K3
Design Arena: agents building Android apps12041256Kimi K3
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building games12141252Kimi K3
Design Arena: HTML slidesNot measured1256Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1273Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench researchNot measured79.0%Only Kimi K3 measured
LiveBench browserNot measured16.0%Only Kimi K3 measured
LiveBench long agenticNot measured42.8%Only Kimi K3 measured
Finance Agent (Vals AI)Not measured53.1%Only Kimi K3 measured
Tax Agent Bench (Vals AI)Not measured33.4%Only Kimi K3 measured
Legal Research Bench (Vals AI)Not measured46.1%Only Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)Not measured66.7%Only Kimi K3 measured
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%47.8%Kimi K3
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
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2$8,018$5,165Claude Opus 4.6
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index58
Reasoning benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
GPQA Diamond89.7%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)83.9%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)89.6%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)39.9%46.9%Kimi K3
GPQA Diamond (Epoch AI run)90.5%93.1%Kimi K3
ARC-AGI94.0%94.5%Kimi K3
ARC-AGI-269.2%60.4%Claude Opus 4.6
SimpleBench67.6%60.7%Claude Opus 4.6
Chess puzzles21.0%37.0%Kimi K3
Mystery game puzzles25.0%26.0%Kimi K3
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251495Claude Opus 4.6
LMArena Text: expert15441520Claude Opus 4.6
LMArena Text: hard prompts in English15301496Claude Opus 4.6
LMArena Vision: diagrams1340Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: homework1337Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%97.2%Kimi K3
FrontierMath, tiers 1 to 366.0%72.2%Kimi K3
FrontierMath, tier 426.8%39.0%Kimi K3
ProofBench50.0%87.0%Kimi K3
LMArena Text: math15181494Claude Opus 4.6
LMArena Text: mathematical work15251505Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
MMLU Pro89.1%88.0%Claude Opus 4.6
LegalBench (Vals AI)85.3%86.2%Kimi K3
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%71.6%Kimi K3
TaxEval (Vals AI)76.0%75.7%Claude Opus 4.6
MortgageTax (Vals AI)68.5%66.3%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%49.4%Kimi K3
SimpleQA Verified47.0%50.6%Kimi K3
LMArena Text: science15191508Claude Opus 4.6
LMArena Text: medicine and healthcare15041489Claude Opus 4.6
LMArena Text: legal and government15121503Claude Opus 4.6
LMArena Text: business and finance14971470Claude Opus 4.6
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
Design Arena: websites12911336Kimi K3
Design Arena: UI components12841345Kimi K3
Design Arena: game dev12781361Kimi K3
Design Arena: data viz12791350Kimi K3
Design Arena: 3D12741388Kimi K3
Design Arena: all code categories12891361Kimi K3
Design Arena: SVG12271301Kimi K3
Design Arena: ASCII art1254Not measuredOnly Claude Opus 4.6 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index175
General benchmarks for Claude Opus 4.6 and Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)51.6%52.8%Kimi K3
MedScribe (Vals AI)86.7%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%88.7%Kimi K3
DTBench91.2%91.2%Tie
LMCA55.8%52.7%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assembly28.3%34.2%Kimi K3
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011476Claude Opus 4.6
LMArena Text: instruction following15211485Claude Opus 4.6
LMArena Text: creative writing15051457Claude Opus 4.6
LMArena Vision1316Not measuredOnly Claude Opus 4.6 measured
LMArena Text: English15111481Claude Opus 4.6
LMArena Text: non-English14881466Claude Opus 4.6
LMArena Text: Chinese15511529Claude Opus 4.6
LMArena Text: German15001490Claude Opus 4.6
LMArena Text: Japanese14881494Kimi K3
LMArena Text: Korean14641460Claude Opus 4.6
LMArena Text: French15121492Claude Opus 4.6
LMArena Text: Spanish15101472Claude Opus 4.6
LMArena Text: Russian14971485Claude Opus 4.6
LMArena Text: Polish14991458Claude Opus 4.6
LMArena Text: multi-turn15111489Claude Opus 4.6
LMArena Text: longer queries15181494Claude Opus 4.6
LMArena Text: writing and language15021471Claude Opus 4.6
LMArena Text: entertainment and media14921453Claude Opus 4.6
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 7 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 Kimi K3
BenchmarkClaude Opus 4.6Kimi K3Leader
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
Kimi K3$0.0062Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
Kimi K3$0.048Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
Kimi K3$0.167Fits in one request

Kimi K3 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 Kimi K3
SpecificationAnthropic Claude Opus 4.6MoonshotAI Kimi K3
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedFebruary 4, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.239
Output $/Mtok$25.00$11.936
Coding index66.961.8
Independent measurements behind it22
Cost per solved task$1.56$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Kimi K3 for coding?

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 61.8 for Kimi K3. Pick Kimi K3 when output tokens cost 2.1x less, or when a solved task costs $0.81 against $1.56.

Which is cheaper, Claude Opus 4.6 or Kimi K3?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Kimi K3 costs $0.239 and $11.936. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Kimi K3 $0.81.

Which has the bigger context window, Claude Opus 4.6 or Kimi K3?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 4.6 vs Kimi K3 comparison based on?

80 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 2 independent benchmarks and Kimi K3's on 2. Where only one model has a result, the page says so instead of naming a winner.

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