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Claude Opus 4.1 vs Kimi K2.5

Kimi K2.5 leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 23.5 to 22.8, and Kimi K2.5 costs 26.3x less per output token ($2.85 vs $75.00 per million). Updated October 22, 2026; 54 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Kimi K2.5
Claude Opus 4.1Anthropic
Coding
No data
Overall
50.2
Output $/M
$75.00
9
Kimi K2.5Moonshot AI
Coding
38.6
Overall
44.8
Output $/M
$2.85
45
vs boards won of 54 shared

Claude Opus 4.1 or Kimi K2.5: which to pick

Only Kimi K2.5 has a coding score, 38.6 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.

Pick Claude Opus 4.1 for work measured by WeirdML or SimpleBench, where it leads.

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved taskModel BKimi K2.5Moonshot AI38.6/1003 independent benchmarks$0.24 per solved task
Shared results
54
Claude Opus 4.1 only
19
Kimi K2.5 only
45
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 K2.5 38.6 from 3 benchmarks.
Widest category
Math, 10.2 points apart on average over 3 shared benchmarks.
Widest single gap
SAGE (Vals AI): Claude Opus 4.1 31.4% against Kimi K2.5 49.9%, 18.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Kimi K2.5 $2.85 per million output tokens, 26.3x apart.
Context window
Claude Opus 4.1 takes 200K tokens, Kimi K2.5 262K.

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 K2.5Ties
Coding16
Intelligence02
Reasoning15
Math03
Knowledge27
Web design26
General316
All shared boards945
CodingLike-for-likeSix of these boards feed the Vibe Coding Index16
Coding benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LMArena WebDev13901437Kimi K2.5
AA Coding IndexNot measured46.8Only Kimi K2.5 measured
LiveCodeBench (Vals AI)66.5%83.9%Kimi K2.5
SWE-bench Verified (Vals AI)Not measured70.0%Only Kimi K2.5 measured
Vibe Code Bench (Vals AI)Not measured17.5%Only Kimi K2.5 measured
Code migration (Vals AI)Not measured7.0%Only Kimi K2.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Kimi K2.5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured34.8%Only Kimi K2.5 measured
Terminal-Bench38.0%43.2%Kimi K2.5
WeirdML45.9%45.6%Claude Opus 4.1
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
ALE-BenchNot measured821.6Only Kimi K2.5 measured
LMArena Text: coding14791483Kimi K2.5
LMArena Text: software and IT14561471Kimi K2.5
LMArena WebDev: ReactNot measured1429Only Kimi K2.5 measured
LMArena WebDev: HTML13991426Kimi K2.5
LMArena WebDev: from an imageNot measured1439Only Kimi K2.5 measured
SciCode4.6%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
AA Intelligence Index22.823.5Kimi K2.5
Epoch Capabilities Index144.1148.1Kimi K2.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index14 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
Design Arena: agents building web appsNot measured1136Only Kimi K2.5 measured
Design Arena: agents building full-stack appsNot measured1114Only Kimi K2.5 measured
Design Arena: agents building mobile appsNot measured1147Only Kimi K2.5 measured
Design Arena: agents building Android appsNot measured1118Only Kimi K2.5 measured
Design Arena: agents building Godot gamesNot measured1219Only Kimi K2.5 measured
Finance Agent (Vals AI)Not measured35.8%Only Kimi K2.5 measured
Legal Research Bench (Vals AI)Not measured15.9%Only Kimi K2.5 measured
Excel Modeling Benchmark (Vals AI)Not measured28.5%Only Kimi K2.5 measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.5 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
OSWorldNot measured63.3%Only Kimi K2.5 measured
Vending-Bench 2Not measured$1,198Only Kimi K2.5 measured
Neither model has a result on the other 27 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
Reasoning benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
GPQA Diamond76.3%84.1%Kimi K2.5
MMMU Pro (Vals AI)77.5%84.3%Kimi K2.5
GPQA Diamond (Artificial Analysis run)Not measured87.9%Only Kimi K2.5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured30.7%Only Kimi K2.5 measured
GPQA Diamond (Epoch AI run)77.3%Not measuredOnly Claude Opus 4.1 measured
ARC-AGINot measured65.3%Only Kimi K2.5 measured
ARC-AGI-2Not measured11.8%Only Kimi K2.5 measured
SimpleBench60.0%46.8%Claude Opus 4.1
Mystery game puzzles21.0%Not measuredOnly Claude Opus 4.1 measured
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421453Kimi K2.5
LMArena Text: expert14381466Kimi K2.5
LMArena Text: hard prompts in English14511460Kimi K2.5
LMArena Vision: diagramsNot measured1282Only Kimi K2.5 measured
LMArena Vision: homeworkNot measured1297Only Kimi K2.5 measured
Kagi LLM BenchmarkNot measured78.5%Only Kimi K2.5 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
AIME78.2%95.6%Kimi K2.5
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%Not measuredOnly Claude Opus 4.1 measured
FrontierMath, tiers 1 to 312.6%Not measuredOnly Claude Opus 4.1 measured
FrontierMath, tier 42.4%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: math14311470Kimi K2.5
LMArena Text: mathematical work14341473Kimi K2.5
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index27
Knowledge benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
MMLU Pro87.9%85.9%Claude Opus 4.1
LegalBench (Vals AI)83.5%Not measuredOnly Claude Opus 4.1 measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)Not measured68.3%Only Kimi K2.5 measured
TaxEval (Vals AI)73.7%74.2%Kimi K2.5
MortgageTax (Vals AI)61.1%66.5%Kimi K2.5
MedQA (Vals AI)93.6%94.4%Kimi K2.5
MedCode (Vals AI)47.2%39.3%Claude Opus 4.1
SimpleQA VerifiedNot measured34.3%Only Kimi K2.5 measured
LMArena Text: science14221459Kimi K2.5
LMArena Text: medicine and healthcare14161448Kimi K2.5
LMArena Text: legal and government14211441Kimi K2.5
LMArena Text: business and finance14061427Kimi K2.5
FACTS Benchmark Suite40.4%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index26
Web design benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
Design Arena: websites11761248Kimi K2.5
Design Arena: UI components11621234Kimi K2.5
Design Arena: game dev11711206Kimi K2.5
Design Arena: data viz11661219Kimi K2.5
Design Arena: 3D11521204Kimi K2.5
Design Arena: all code categories11701236Kimi K2.5
Design Arena: SVG11521149Claude Opus 4.1
Design Arena: ASCII art11671166Claude Opus 4.1
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index316
General benchmarks for Claude Opus 4.1 and Kimi K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
SAGE (Vals AI)31.4%49.9%Kimi K2.5
MedScribe (Vals AI)73.9%76.4%Kimi K2.5
IFBenchNot measured70.2%Only Kimi K2.5 measured
Long context reasoning (AA-LCR)Not measured78.0%Only Kimi K2.5 measured
DTBench80.0%Not measuredOnly Claude Opus 4.1 measured
LMCA37.1%Not measuredOnly Claude Opus 4.1 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text14191445Kimi K2.5
LMArena Text: instruction following14351431Claude Opus 4.1
LMArena Text: creative writing14121422Kimi K2.5
LMArena VisionNot measured1269Only Kimi K2.5 measured
LMArena Text: English14331453Kimi K2.5
LMArena Text: non-English14051433Kimi K2.5
LMArena Text: Chinese14271494Kimi K2.5
LMArena Text: German14131441Kimi K2.5
LMArena Text: Japanese13771423Kimi K2.5
LMArena Text: Korean13811412Kimi K2.5
LMArena Text: French14331454Kimi K2.5
LMArena Text: Spanish14481450Kimi K2.5
LMArena Text: Russian14221435Kimi K2.5
LMArena Text: Polish14131445Kimi K2.5
LMArena Text: multi-turn14441444Claude Opus 4.1
LMArena Text: longer queries14551445Claude Opus 4.1
LMArena Text: writing and language14181425Kimi K2.5
LMArena Text: entertainment and media13981417Kimi K2.5
LMArena Vision: EnglishNot measured1274Only Kimi K2.5 measured
LMArena Vision: ChineseNot measured1328Only Kimi K2.5 measured
LMArena Vision: reading textNot measured1276Only Kimi K2.5 measured
LMArena Vision: humorNot measured1284Only Kimi K2.5 measured
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing thingsNot measured1285Only Kimi K2.5 measured
LMArena Vision: creative writingNot measured1269Only Kimi K2.5 measured
Neither model has a result on the other 11 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 K2.5
BenchmarkClaude Opus 4.1Kimi K2.5Leader
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 K2.5$0.0020Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Kimi K2.5$0.035Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Kimi K2.5$0.135Fits in one request

Kimi K2.5 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 K2.5
SpecificationAnthropic Claude Opus 4.1MoonshotAI Kimi K2.5
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedAugust 5, 2025January 27, 2026
Context window200K262K
Input $/Mtok$15.00$0.532
Output $/Mtok$75.00$2.85
Coding indexNot benchmarked38.6
Independent measurements behind it13
Cost per solved taskNot computable$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Kimi K2.5 for coding?

Only Kimi K2.5 has a coding score, 38.6 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for work measured by WeirdML or SimpleBench, where it leads.

Which is cheaper, Claude Opus 4.1 or Kimi K2.5?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Kimi K2.5 costs $0.532 and $2.85. Cost per solved task is known for Kimi K2.5 only.

Which has the bigger context window, Claude Opus 4.1 or Kimi K2.5?

Kimi K2.5, with 262K tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Kimi K2.5 comparison based on?

54 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 K2.5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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