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Claude Sonnet 4.6 vs Kimi K2.5

Claude Sonnet 4.6 leads Kimi K2.5 on coding, 57.3 to 38.6 on the Vibe Coding Index, and Kimi K2.5 costs 5.3x less per output token ($2.85 vs $15.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace Claude Sonnet 4.6 Replace Kimi K2.5
Claude Sonnet 4.6Anthropic
Coding
57.3
Overall
60.3
Output $/M
$15.00
70
Kimi K2.5Moonshot AI
Coding
38.6
Overall
44.8
Output $/M
$2.85
18
vs boards won of 88 shared

Claude Sonnet 4.6 or Kimi K2.5: which to pick

Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 38.6 for Kimi K2.5.

Pick Kimi K2.5 for output tokens 5.3x cheaper ($2.85 vs $15.00 per million) and a lower cost per solved task ($0.24 against $1.68).

Model AClaude Sonnet 4.6Anthropic57.3/1005 independent benchmarks$1.68 per solved taskModel BKimi K2.5Moonshot AI38.6/1003 independent benchmarks$0.24 per solved task
Shared results
88
Claude Sonnet 4.6 only
30
Kimi K2.5 only
11
Like-for-like categories
8 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 Sonnet 4.6 57.3 from 5 benchmarks, Kimi K2.5 38.6 from 3 benchmarks.
Widest category
Agentic work, 15.5 points apart on average over 11 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Sonnet 4.6 60.4% against Kimi K2.5 11.8%, 48.6 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.6 $15.00 against Kimi K2.5 $2.85 per million output tokens, 5.3x apart.
Context window
Claude Sonnet 4.6 takes 1M 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 Sonnet 4.6BarsKimi K2.5Ties
Coding141
Intelligence20
Agentic work101
Reasoning92
Math12
Knowledge92
Web design80
General1710
All shared boards7018
CodingLike-for-likeSix of these boards feed the Vibe Coding Index141
Coding benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LiveBench coding66.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena WebDev15231437Claude Sonnet 4.6
AA Coding Index63.046.8Claude Sonnet 4.6
LiveCodeBench (Vals AI)82.1%83.9%Kimi K2.5
SWE-bench Verified (Vals AI)77.4%70.0%Claude Sonnet 4.6
Vibe Code Bench (Vals AI)55.8%17.5%Claude Sonnet 4.6
Code migration (Vals AI)39.9%7.0%Claude Sonnet 4.6
ProgramBench (Vals AI)0.5%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench 2.1 (Vals AI)57.3%42.0%Claude Sonnet 4.6
SkillsBench (Vals AI)49.0%Not measuredOnly Claude Sonnet 4.6 measured
SciCode50.1%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench Hard (Artificial Analysis run)53.0%34.8%Claude Sonnet 4.6
Terminal-Bench53.4%43.2%Claude Sonnet 4.6
FrontierCode24.3%Not measuredOnly Claude Sonnet 4.6 measured
WeirdML66.1%45.6%Claude Sonnet 4.6
ALE-BenchNot measured821.6Only Kimi K2.5 measured
LMArena Text: coding15031483Claude Sonnet 4.6
LMArena Text: software and IT14911471Claude Sonnet 4.6
LMArena WebDev: React15121429Claude Sonnet 4.6
LMArena WebDev: HTML15271426Claude Sonnet 4.6
LMArena WebDev: from an image15291439Claude Sonnet 4.6
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
AA Intelligence Index30.123.5Claude Sonnet 4.6
Epoch Capabilities Index152.8148.1Claude Sonnet 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index101
Agentic work benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
AA Agentic Index31.8Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building web apps11901136Claude Sonnet 4.6
Design Arena: agents building full-stack apps12131114Claude Sonnet 4.6
Design Arena: agents building mobile apps12121147Claude Sonnet 4.6
Design Arena: agents building Android apps11971118Claude Sonnet 4.6
Design Arena: agents building Godot games12261219Claude Sonnet 4.6
Design Arena: agents building games1177Not measuredOnly Claude Sonnet 4.6 measured
LiveBench research63.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench browser68.0%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench long agentic23.1%Not measuredOnly Claude Sonnet 4.6 measured
Finance Agent (Vals AI)51.0%35.8%Claude Sonnet 4.6
Tax Agent Bench (Vals AI)25.8%Not measuredOnly Claude Sonnet 4.6 measured
Legal Research Bench (Vals AI)38.5%15.9%Claude Sonnet 4.6
Excel Modeling Benchmark (Vals AI)60.2%28.5%Claude Sonnet 4.6
τ²-Bench Telecom79.5%95.9%Kimi K2.5
APEX-Agents43.0%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld 2.09.3%Not measuredOnly Claude Sonnet 4.6 measured
DeepResearch Bench54.9%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld72.1%63.3%Claude Sonnet 4.6
Vending-Bench 2$7,204$1,198Claude Sonnet 4.6
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index92
Reasoning benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
GPQA Diamond85.6%84.1%Claude Sonnet 4.6
LiveBench reasoning86.4%Not measuredOnly Claude Sonnet 4.6 measured
MMMU Pro (Vals AI)83.6%84.3%Kimi K2.5
GPQA Diamond (Artificial Analysis run)87.5%87.9%Kimi K2.5
Humanity's Last Exam (Artificial Analysis run)33.6%30.7%Claude Sonnet 4.6
GPQA Diamond (Epoch AI run)87.4%Not measuredOnly Claude Sonnet 4.6 measured
ARC-AGI86.5%65.3%Claude Sonnet 4.6
ARC-AGI-260.4%11.8%Claude Sonnet 4.6
SimpleBenchNot measured46.8%Only Kimi K2.5 measured
Chess puzzles23.0%Not measuredOnly Claude Sonnet 4.6 measured
Mystery game puzzles16.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: hard prompts14851453Claude Sonnet 4.6
LMArena Text: expert15001466Claude Sonnet 4.6
LMArena Text: hard prompts in English14931460Claude Sonnet 4.6
LMArena Vision: diagrams13061282Claude Sonnet 4.6
LMArena Vision: homework13111297Claude Sonnet 4.6
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 index12
Math benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
AIME92.3%95.6%Kimi K2.5
OTIS Mock AIME85.8%Not measuredOnly Claude Sonnet 4.6 measured
ProofBench45.0%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text: math14621470Kimi K2.5
LMArena Text: mathematical work14831473Claude Sonnet 4.6
Neither model has a result on the other 8 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index92
Knowledge benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
MMLU Pro87.3%85.9%Claude Sonnet 4.6
LegalBench (Vals AI)82.1%Not measuredOnly Claude Sonnet 4.6 measured
CaseLaw (Vals AI)64.0%58.7%Claude Sonnet 4.6
CorpFin (Vals AI)65.3%68.3%Kimi K2.5
TaxEval (Vals AI)77.1%74.2%Claude Sonnet 4.6
MortgageTax (Vals AI)67.7%66.5%Claude Sonnet 4.6
MedQA (Vals AI)92.1%94.4%Kimi K2.5
MedCode (Vals AI)Not measured39.3%Only Kimi K2.5 measured
SimpleQA Verified35.5%34.3%Claude Sonnet 4.6
LMArena Text: science14741459Claude Sonnet 4.6
LMArena Text: medicine and healthcare14511448Claude Sonnet 4.6
LMArena Text: legal and government14701441Claude Sonnet 4.6
LMArena Text: business and finance14641427Claude Sonnet 4.6
FACTS Benchmark Suite37.0%Not measuredOnly Claude Sonnet 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 Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
Design Arena: websites12841248Claude Sonnet 4.6
Design Arena: UI components12691234Claude Sonnet 4.6
Design Arena: game dev12581206Claude Sonnet 4.6
Design Arena: data viz12781219Claude Sonnet 4.6
Design Arena: 3D12341204Claude Sonnet 4.6
Design Arena: all code categories12751236Claude Sonnet 4.6
Design Arena: SVG11961149Claude Sonnet 4.6
Design Arena: ASCII art12351166Claude Sonnet 4.6
LiveBench design71.8%Not measuredOnly Claude Sonnet 4.6 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1710
General benchmarks for Claude Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi K2.5Leader
LiveBench data analysis76.1%Not measuredOnly Claude Sonnet 4.6 measured
Public Benefits Bench (Vals AI)62.5%Not measuredOnly Claude Sonnet 4.6 measured
SAGE (Vals AI)46.6%49.9%Kimi K2.5
MedScribe (Vals AI)Not measured76.4%Only Kimi K2.5 measured
Vals Multimodal Index60.6%Not measuredOnly Claude Sonnet 4.6 measured
IFBench56.6%70.2%Kimi K2.5
Long context reasoning (AA-LCR)80.0%78.0%Claude Sonnet 4.6
DTBench89.9%Not measuredOnly Claude Sonnet 4.6 measured
LMCA46.5%Not measuredOnly Claude Sonnet 4.6 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
ExploitBench23.6%Not measuredOnly Claude Sonnet 4.6 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text14581445Claude Sonnet 4.6
LMArena Text: instruction following14761431Claude Sonnet 4.6
LMArena Text: creative writing14351422Claude Sonnet 4.6
LMArena Vision12831269Claude Sonnet 4.6
LMArena Text: English14721453Claude Sonnet 4.6
LMArena Text: non-English14401433Claude Sonnet 4.6
LMArena Text: Chinese14911494Kimi K2.5
LMArena Text: German14281441Kimi K2.5
LMArena Text: Japanese14201423Kimi K2.5
LMArena Text: Korean14101412Kimi K2.5
LMArena Text: French14651454Claude Sonnet 4.6
LMArena Text: Spanish14641450Claude Sonnet 4.6
LMArena Text: Russian14401435Claude Sonnet 4.6
LMArena Text: Polish14431445Kimi K2.5
LMArena Text: multi-turn14641444Claude Sonnet 4.6
LMArena Text: longer queries14791445Claude Sonnet 4.6
LMArena Text: writing and language14441425Claude Sonnet 4.6
LMArena Text: entertainment and media14311417Claude Sonnet 4.6
LMArena Vision: English12981274Claude Sonnet 4.6
LMArena Vision: Chinese13071328Kimi K2.5
LMArena Vision: reading text12961276Claude Sonnet 4.6
LMArena Vision: humor12481284Kimi K2.5
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing things11951285Kimi K2.5
LMArena Vision: creative writing12721269Claude Sonnet 4.6
LMArena Document1482Not measuredOnly Claude Sonnet 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 Sonnet 4.6 and Kimi K2.5
BenchmarkClaude Sonnet 4.6Kimi 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 Sonnet 4.6$0.011Fits in one request
Kimi K2.5$0.0020Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.6$0.195Fits in one request
Kimi K2.5$0.035Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.6$0.750Fits in one request
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 Sonnet 4.6 and Kimi K2.5
SpecificationAnthropic Claude Sonnet 4.6MoonshotAI Kimi K2.5
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedFebruary 17, 2026January 27, 2026
Context window1M262K
Input $/Mtok$3.00$0.532
Output $/Mtok$15.00$2.85
Coding index57.338.6
Independent measurements behind it53
Cost per solved task$1.68$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.6 better than Kimi K2.5 for coding?

Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 38.6 for Kimi K2.5. Pick Kimi K2.5 for output tokens 5.3x cheaper ($2.85 vs $15.00 per million) and a lower cost per solved task ($0.24 against $1.68).

Which is cheaper, Claude Sonnet 4.6 or Kimi K2.5?

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; Kimi K2.5 costs $0.532 and $2.85. Per solved SWE-bench Verified task, Claude Sonnet 4.6 costs $1.68 and Kimi K2.5 $0.24.

Which has the bigger context window, Claude Sonnet 4.6 or Kimi K2.5?

Claude Sonnet 4.6, with 1M tokens against 262K.

How many benchmarks is the Claude Sonnet 4.6 vs Kimi K2.5 comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 4.6's coding index rests on 5 independent benchmarks 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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