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Claude Opus 5 vs Kimi K2.6

Updated October 21, 2026. 102 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace Kimi K2.6
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
100
Kimi K2.6Moonshot AI
Coding
44.2
Overall
27.0
Output $/M
$3.41
2
vs boards won of 102 shared

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 44.2 for Kimi K2.6.

Pick Kimi K2.6 when output tokens cost 7.3x less, or when a solved task costs $0.35 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BKimi K2.6Moonshot AI44.2/1001 independent benchmark$0.35 per solved task
Shared results
102
Claude Opus 5 only
28
Kimi K2.6 only
7
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 5 81.8 from 2 benchmarks, Kimi K2.6 44.2 from 1 benchmark.
Widest category
Math, 30.4 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against Kimi K2.6 16.0%, 83.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Kimi K2.6 $3.41 per million output tokens, 7.3x apart.
Context window
Claude Opus 5 takes 1M tokens, Kimi K2.6 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 5BarsKimi K2.6Ties
Coding160
Intelligence20
Agentic work131
Reasoning130
Math60
Knowledge110
Web design80
General311
All shared boards1002
CodingLike-for-likeFour of these boards feed the Vibe Coding Index160
Coding benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891509Claude Opus 5
AA Coding Index78.061.8Claude Opus 5
LiveCodeBench (Vals AI)89.0%86.8%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%76.2%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%37.9%Claude Opus 5
Code migration (Vals AI)57.5%27.8%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%53.6%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%51.5%Claude Opus 5
Terminal-Bench Hard (Artificial Analysis run)Not measured43.9%Only Kimi K2.6 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%55.9%Claude Opus 5
ALE-Bench2164.61092.7Claude Opus 5
LMArena Text: coding15331489Claude Opus 5
LMArena Text: software and IT15271484Claude Opus 5
LMArena WebDev: React17111505Claude Opus 5
LMArena WebDev: HTML16801485Claude Opus 5
LMArena WebDev: from an image16621521Claude Opus 5
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
AA Intelligence Index50.827.0Claude Opus 5
Epoch Capabilities Index163.9150.9Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index131
Agentic work benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
AA Agentic Index56.520.5Claude Opus 5
Design Arena: agents building web apps12661268Kimi K2.6
Design Arena: agents building full-stack apps13061155Claude Opus 5
Design Arena: agents building mobile apps13481156Claude Opus 5
Design Arena: agents building Android apps12581166Claude Opus 5
Design Arena: agents building Godot games12791120Claude Opus 5
Design Arena: agents building games12611141Claude Opus 5
Design Arena: HTML slidesNot measured1184Only Kimi K2.6 measured
Design Arena: PowerPoint slides12651128Claude Opus 5
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%44.9%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%12.4%Claude Opus 5
Legal Research Bench (Vals AI)55.3%15.9%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%57.9%Claude Opus 5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.6 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%4.6%Claude Opus 5
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$6,205Claude Opus 5
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index130
Reasoning benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
GPQA Diamond93.4%89.1%Claude Opus 5
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%86.3%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%91.1%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%37.5%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%90.8%Claude Opus 5
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%20.0%Claude Opus 5
Mystery game puzzles59.0%18.0%Claude Opus 5
EBR-bench45.7%2.4%Claude Opus 5
LMArena Text: hard prompts15271470Claude Opus 5
LMArena Text: expert15541491Claude Opus 5
LMArena Text: hard prompts in English15231471Claude Opus 5
LMArena Vision: diagrams13481298Claude Opus 5
LMArena Vision: homework13381310Claude Opus 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
OTIS Mock AIME98.9%96.1%Claude Opus 5
FrontierMath, tiers 1 to 385.6%57.2%Claude Opus 5
FrontierMath, tier 473.2%25.6%Claude Opus 5
ProofBench99.0%16.0%Claude Opus 5
LMArena Text: math15331474Claude Opus 5
LMArena Text: mathematical work15441480Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
MMLU Pro91.6%87.6%Claude Opus 5
LegalBench (Vals AI)87.0%84.7%Claude Opus 5
CaseLaw (Vals AI)Not measured61.2%Only Kimi K2.6 measured
CorpFin (Vals AI)73.2%66.7%Claude Opus 5
TaxEval (Vals AI)75.1%74.7%Claude Opus 5
MortgageTax (Vals AI)72.1%65.8%Claude Opus 5
MedCode (Vals AI)63.6%40.1%Claude Opus 5
SimpleQA Verified59.9%34.9%Claude Opus 5
LMArena Text: science15311468Claude Opus 5
LMArena Text: medicine and healthcare15251457Claude Opus 5
LMArena Text: legal and government15301462Claude Opus 5
LMArena Text: business and finance15011445Claude Opus 5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
Design Arena: websites13091269Claude Opus 5
Design Arena: UI components13481266Claude Opus 5
Design Arena: game dev13391251Claude Opus 5
Design Arena: data viz13291249Claude Opus 5
Design Arena: 3D13351268Claude Opus 5
Design Arena: all code categories13241272Claude Opus 5
Design Arena: SVG13101181Claude Opus 5
Design Arena: ASCII art13521164Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index311
General benchmarks for Claude Opus 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%56.6%Claude Opus 5
SAGE (Vals AI)49.4%50.2%Kimi K2.6
MedScribe (Vals AI)91.0%78.2%Claude Opus 5
Vals Multimodal Index73.9%56.4%Claude Opus 5
IFBenchNot measured76.0%Only Kimi K2.6 measured
Long context reasoning (AA-LCR)82.0%81.0%Claude Opus 5
DTBench97.9%90.9%Claude Opus 5
LMCA64.5%37.3%Claude Opus 5
Furniture assembly60.8%21.7%Claude Opus 5
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text15091455Claude Opus 5
LMArena Text: instruction following15181451Claude Opus 5
LMArena Text: creative writing14931434Claude Opus 5
LMArena Vision13201282Claude Opus 5
LMArena Text: English15081460Claude Opus 5
LMArena Text: non-English15021446Claude Opus 5
LMArena Text: Chinese15731520Claude Opus 5
LMArena Text: German15271451Claude Opus 5
LMArena Text: Japanese15201443Claude Opus 5
LMArena Text: Korean15171427Claude Opus 5
LMArena Text: French15191471Claude Opus 5
LMArena Text: Spanish15231464Claude Opus 5
LMArena Text: Russian15071446Claude Opus 5
LMArena Text: Polish15221438Claude Opus 5
LMArena Text: multi-turn15001453Claude Opus 5
LMArena Text: longer queries15171468Claude Opus 5
LMArena Text: writing and language14991439Claude Opus 5
LMArena Text: entertainment and media14811428Claude Opus 5
LMArena Vision: English13151287Claude Opus 5
LMArena Vision: Chinese14001346Claude Opus 5
LMArena Vision: reading text13291291Claude Opus 5
LMArena Vision: humor12931280Claude Opus 5
LMArena Vision: creative writing13131273Claude Opus 5
LMArena Document15161451Claude Opus 5
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 5 and Kimi K2.6
BenchmarkClaude Opus 5Kimi K2.6Leader
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 5$0.018Fits in one request
Kimi K2.6$0.0024Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
Kimi K2.6$0.043Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
Kimi K2.6$0.164Fits in one request

Kimi K2.6 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 5 and Kimi K2.6
SpecificationAnthropic Claude Opus 5MoonshotAI Kimi K2.6
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 24, 2026April 20, 2026
Context window1M262K
Input $/Mtok$5.00$0.65
Output $/Mtok$25.00$3.41
Coding index81.844.2
Independent measurements behind it21
Cost per solved task$1.33$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Kimi K2.6 for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 44.2 for Kimi K2.6. Pick Kimi K2.6 when output tokens cost 7.3x less, or when a solved task costs $0.35 against $1.33.

Which is cheaper, Claude Opus 5 or Kimi K2.6?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Kimi K2.6 costs $0.65 and $3.41. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Kimi K2.6 $0.35.

Which has the bigger context window, Claude Opus 5 or Kimi K2.6?

Claude Opus 5, with 1M tokens against 262K.

How many benchmarks is the Claude Opus 5 vs Kimi K2.6 comparison based on?

102 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and Kimi K2.6's on 1. Where only one model has a result, the page says so instead of naming a winner.

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