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Claude Opus 4.1 vs Kimi K3

Kimi K3 leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 43.6 to 22.8, and Kimi K3 costs 5.0x less per output token ($15.00 vs $75.00 per million). Updated October 22, 2026; 58 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Kimi K3
Claude Opus 4.1Anthropic
Coding
No data
Overall
50.2
Output $/M
$75.00
0
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
58
vs boards won of 58 shared

Claude Opus 4.1 or Kimi K3: which to pick

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.

Compare them on price, context and the boards below.

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
58
Claude Opus 4.1 only
15
Kimi K3 only
59
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 4.1 not benchmarked, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 29.4 points apart on average over 5 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Claude Opus 4.1 12.6% against Kimi K3 72.2%, 59.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Kimi K3 $15.00 per million output tokens, 5.0x apart.
Context window
Claude Opus 4.1 takes 200K 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 4.1BarsKimi K3Ties
Coding06
Intelligence02
Reasoning08
Math05
Knowledge09
Web design07
General021
All shared boards058
CodingLike-for-likeSix of these boards feed the Vibe Coding Index06
Coding benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDev13901655Kimi K3
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)66.5%87.2%Kimi K3
SWE-bench Verified (Vals AI)Not measured93.4%Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)Not measured85.0%Only Kimi K3 measured
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-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML45.9%82.6%Kimi K3
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
ALE-BenchNot measured1524.5Only Kimi K3 measured
LMArena Text: coding14791508Kimi K3
LMArena Text: software and IT14561499Kimi K3
LMArena WebDev: ReactNot measured1670Only Kimi K3 measured
LMArena WebDev: HTML13991644Kimi K3
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
SciCode4.6%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
AA Intelligence Index22.843.6Kimi K3
Epoch Capabilities Index144.1157.9Kimi K3
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index27 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web appsNot measured1295Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1269Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1253Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1206Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1247Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1070Only 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
APEX-AgentsNot measured47.8%Only Kimi K3 measured
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index08
Reasoning benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
GPQA Diamond76.3%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)77.5%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)Not measured93.5%Only Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured46.9%Only Kimi K3 measured
GPQA Diamond (Epoch AI run)77.3%93.1%Kimi K3
ARC-AGINot measured94.5%Only Kimi K3 measured
ARC-AGI-2Not measured60.4%Only Kimi K3 measured
SimpleBench60.0%60.7%Kimi K3
Chess puzzlesNot measured37.0%Only Kimi K3 measured
Mystery game puzzles21.0%26.0%Kimi K3
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421495Kimi K3
LMArena Text: expert14381520Kimi K3
LMArena Text: hard prompts in English14511496Kimi K3
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
OTIS Mock AIME68.9%97.2%Kimi K3
FrontierMath, tiers 1 to 312.6%72.2%Kimi K3
FrontierMath, tier 42.4%39.0%Kimi K3
ProofBenchNot measured87.0%Only Kimi K3 measured
LMArena Text: math14311494Kimi K3
LMArena Text: mathematical work14341505Kimi K3
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index09
Knowledge benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
MMLU Pro87.9%88.0%Kimi K3
LegalBench (Vals AI)83.5%86.2%Kimi K3
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)73.7%75.7%Kimi K3
MortgageTax (Vals AI)61.1%66.3%Kimi K3
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%49.4%Kimi K3
SimpleQA VerifiedNot measured50.6%Only Kimi K3 measured
LMArena Text: science14221508Kimi K3
LMArena Text: medicine and healthcare14161489Kimi K3
LMArena Text: legal and government14211503Kimi K3
LMArena Text: business and finance14061470Kimi K3
FACTS Benchmark Suite40.4%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi K3Leader
Design Arena: websites11761334Kimi K3
Design Arena: UI components11621341Kimi K3
Design Arena: game dev11711358Kimi K3
Design Arena: data viz11661351Kimi K3
Design Arena: 3D11521387Kimi K3
Design Arena: all code categories11701360Kimi K3
Design Arena: SVG11521302Kimi K3
Design Arena: ASCII art1167Not measuredOnly Claude Opus 4.1 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index021
General benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi 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)31.4%52.8%Kimi K3
MedScribe (Vals AI)73.9%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)Not measured88.7%Only Kimi K3 measured
DTBench80.0%91.2%Kimi K3
LMCA37.1%52.7%Kimi K3
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text14191476Kimi K3
LMArena Text: instruction following14351485Kimi K3
LMArena Text: creative writing14121457Kimi K3
LMArena Text: English14331481Kimi K3
LMArena Text: non-English14051466Kimi K3
LMArena Text: Chinese14271529Kimi K3
LMArena Text: German14131490Kimi K3
LMArena Text: Japanese13771494Kimi K3
LMArena Text: Korean13811460Kimi K3
LMArena Text: French14331492Kimi K3
LMArena Text: Spanish14481472Kimi K3
LMArena Text: Russian14221485Kimi K3
LMArena Text: Polish14131458Kimi K3
LMArena Text: multi-turn14441489Kimi K3
LMArena Text: longer queries14551494Kimi K3
LMArena Text: writing and language14181471Kimi K3
LMArena Text: entertainment and media13981453Kimi K3
Neither model has a result on the other 17 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.1 and Kimi K3
BenchmarkClaude Opus 4.1Kimi 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 4.1$0.052Fits in one request
Kimi K3$0.011Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Kimi K3$0.195Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Kimi K3$0.750Fits 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 4.1 and Kimi K3
SpecificationAnthropic Claude Opus 4.1MoonshotAI Kimi K3
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedAugust 5, 2025July 16, 2026
Context window200K1.05M
Input $/Mtok$15.00$3.00
Output $/Mtok$75.00$15.00
Coding indexNot benchmarked62.3
Independent measurements behind it16
Cost per solved taskNot computable$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Kimi K3 for coding?

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Compare them on price, context and the boards below.

Which is cheaper, Claude Opus 4.1 or Kimi K3?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Claude Opus 4.1 or Kimi K3?

Kimi K3, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Kimi K3 comparison based on?

58 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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