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GPT-5.1 vs Kimi K2.6

Updated October 21, 2026. 81 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.1 Replace Kimi K2.6
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
13
Kimi K2.6Moonshot AI
Coding
44.2
Overall
27.0
Output $/M
$3.41
68
vs boards won of 81 shared

Decision reading

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 44.2 for Kimi K2.6.

Pick Kimi K2.6 when output tokens cost 2.9x less, or when a solved task costs $0.35 against $1.02.

Model AGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved taskModel BKimi K2.6Moonshot AI44.2/1001 independent benchmark$0.35 per solved task
Shared results
81
GPT-5.1 only
19
Kimi K2.6 only
28
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
GPT-5.1 53.3 from 2 benchmarks, Kimi K2.6 44.2 from 1 benchmark.
Widest category
Agentic work, 21.8 points apart on average over 2 shared benchmarks.
Widest single gap
LMArena WebDev: React: GPT-5.1 1307 against Kimi K2.6 1505, 33.1 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against Kimi K2.6 $3.41 per million output tokens, 2.9x apart.
Context window
GPT-5.1 takes 400K 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
CategoryGPT-5.1BarsKimi K2.6Ties
Coding210
Intelligence02
Agentic work02
Reasoning210
Math03
Knowledge57
Web design08
General426
All shared boards1368
CodingLike-for-likeFour of these boards feed the Vibe Coding Index210
Coding benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1 measured
LMArena WebDev13961509Kimi K2.6
AA Coding Index49.461.8Kimi K2.6
LiveCodeBench (Vals AI)86.5%86.8%Kimi K2.6
SWE-bench Verified (Vals AI)69.8%76.2%Kimi K2.6
Vibe Code Bench (Vals AI)24.6%37.9%Kimi K2.6
Code migration (Vals AI)Not measured27.8%Only Kimi K2.6 measured
ProgramBench (Vals AI)Not measured0.0%Only Kimi K2.6 measured
Terminal-Bench 2.1 (Vals AI)Not measured53.6%Only Kimi K2.6 measured
LiveCodeBench (Artificial Analysis run)86.8%Not measuredOnly GPT-5.1 measured
SciCodeNot measured51.5%Only Kimi K2.6 measured
Terminal-Bench Hard (Artificial Analysis run)45.5%43.9%GPT-5.1
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
GSO-Bench13.7%Not measuredOnly GPT-5.1 measured
WeirdML60.8%55.9%GPT-5.1
ALE-BenchNot measured1092.7Only Kimi K2.6 measured
LMArena Text: coding14531489Kimi K2.6
LMArena Text: software and IT14541484Kimi K2.6
LMArena WebDev: React13071505Kimi K2.6
LMArena WebDev: HTML14051485Kimi K2.6
LMArena WebDev: from an image14211521Kimi K2.6
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
AA Intelligence Index24.727.0Kimi K2.6
Epoch Capabilities Index149.8150.9Kimi K2.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index02
Agentic work benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
AA Agentic IndexNot measured20.5Only Kimi K2.6 measured
Design Arena: agents building web appsNot measured1268Only Kimi K2.6 measured
Design Arena: agents building full-stack appsNot measured1155Only Kimi K2.6 measured
Design Arena: agents building mobile appsNot measured1156Only Kimi K2.6 measured
Design Arena: agents building Android appsNot measured1166Only Kimi K2.6 measured
Design Arena: agents building Godot gamesNot measured1120Only Kimi K2.6 measured
Design Arena: agents building gamesNot measured1141Only Kimi K2.6 measured
Design Arena: HTML slidesNot measured1184Only Kimi K2.6 measured
Design Arena: PowerPoint slidesNot measured1128Only Kimi K2.6 measured
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
Finance Agent (Vals AI)Not measured44.9%Only Kimi K2.6 measured
Tax Agent Bench (Vals AI)Not measured12.4%Only Kimi K2.6 measured
Legal Research Bench (Vals AI)Not measured15.9%Only Kimi K2.6 measured
Excel Modeling Benchmark (Vals AI)Not measured57.9%Only Kimi K2.6 measured
τ²-Bench Telecom81.9%95.9%Kimi K2.6
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
Vending-Bench 2$1,473$6,205Kimi K2.6
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index210
Reasoning benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
GPQA Diamond86.6%89.1%Kimi K2.6
MMMU Pro (Vals AI)83.2%86.3%Kimi K2.6
GPQA Diamond (Artificial Analysis run)87.3%91.1%Kimi K2.6
Humanity's Last Exam (Artificial Analysis run)28.5%37.5%Kimi K2.6
GPQA Diamond (Epoch AI run)87.6%90.8%Kimi K2.6
ARC-AGI72.8%Not measuredOnly GPT-5.1 measured
ARC-AGI-217.6%Not measuredOnly GPT-5.1 measured
SimpleBench53.2%Not measuredOnly GPT-5.1 measured
Chess puzzles42.0%20.0%GPT-5.1
Mystery game puzzles19.0%18.0%GPT-5.1
EBR-benchNot measured2.4%Only Kimi K2.6 measured
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571470Kimi K2.6
LMArena Text: expert14701491Kimi K2.6
LMArena Text: hard prompts in English14621471Kimi K2.6
LMArena Vision: diagrams12641298Kimi K2.6
LMArena Vision: homework12721310Kimi K2.6
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
AIME93.3%Not measuredOnly GPT-5.1 measured
MGSM (Vals AI)93.0%Not measuredOnly GPT-5.1 measured
AA Math Index94.0Not measuredOnly GPT-5.1 measured
AIME 2025 (Artificial Analysis run)94.0%Not measuredOnly GPT-5.1 measured
OTIS Mock AIME88.6%96.1%Kimi K2.6
FrontierMath, tiers 1 to 3Not measured57.2%Only Kimi K2.6 measured
FrontierMath, tier 4Not measured25.6%Only Kimi K2.6 measured
ProofBenchNot measured16.0%Only Kimi K2.6 measured
LMArena Text: math14461474Kimi K2.6
LMArena Text: mathematical work14491480Kimi K2.6
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index57
Knowledge benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
MMLU Pro86.4%87.6%Kimi K2.6
LegalBench (Vals AI)85.7%84.7%GPT-5.1
CaseLaw (Vals AI)73.4%61.2%GPT-5.1
CorpFin (Vals AI)63.8%66.7%Kimi K2.6
TaxEval (Vals AI)74.9%74.7%GPT-5.1
MortgageTax (Vals AI)61.4%65.8%Kimi K2.6
MedQA (Vals AI)96.4%Not measuredOnly GPT-5.1 measured
MedCode (Vals AI)52.7%40.1%GPT-5.1
MMLU Pro (Artificial Analysis run)87.0%Not measuredOnly GPT-5.1 measured
SimpleQA Verified48.0%34.9%GPT-5.1
LMArena Text: science14591468Kimi K2.6
LMArena Text: medicine and healthcare14561457Kimi K2.6
LMArena Text: legal and government14591462Kimi K2.6
LMArena Text: business and finance14311445Kimi K2.6
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
Design Arena: websites11871269Kimi K2.6
Design Arena: UI components11661266Kimi K2.6
Design Arena: game dev11791251Kimi K2.6
Design Arena: data viz12041249Kimi K2.6
Design Arena: 3D10611268Kimi K2.6
Design Arena: all code categories11711272Kimi K2.6
Design Arena: SVG11491181Kimi K2.6
Design Arena: ASCII art11181164Kimi K2.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index426
General benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi K2.6Leader
Public Benefits Bench (Vals AI)Not measured56.6%Only Kimi K2.6 measured
SAGE (Vals AI)43.2%50.2%Kimi K2.6
MedScribe (Vals AI)88.1%78.2%GPT-5.1
Vals Multimodal IndexNot measured56.4%Only Kimi K2.6 measured
IFBench72.9%76.0%Kimi K2.6
Long context reasoning (AA-LCR)80.0%81.0%Kimi K2.6
DTBench90.1%90.9%Kimi K2.6
LMCA43.9%37.3%GPT-5.1
CL-bench23.7%Not measuredOnly GPT-5.1 measured
Furniture assemblyNot measured21.7%Only Kimi K2.6 measured
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431455Kimi K2.6
LMArena Text: instruction following14431451Kimi K2.6
LMArena Text: creative writing14271434Kimi K2.6
LMArena Vision12501282Kimi K2.6
LMArena Text: English14511460Kimi K2.6
LMArena Text: non-English14311446Kimi K2.6
LMArena Text: Chinese14951520Kimi K2.6
LMArena Text: German14381451Kimi K2.6
LMArena Text: Japanese14531443GPT-5.1
LMArena Text: Korean14011427Kimi K2.6
LMArena Text: French14501471Kimi K2.6
LMArena Text: Spanish14331464Kimi K2.6
LMArena Text: Russian14351446Kimi K2.6
LMArena Text: Polish14401438GPT-5.1
LMArena Text: multi-turn14501453Kimi K2.6
LMArena Text: longer queries14481468Kimi K2.6
LMArena Text: writing and language14281439Kimi K2.6
LMArena Text: entertainment and media14151428Kimi K2.6
LMArena Vision: English12521287Kimi K2.6
LMArena Vision: Chinese12701346Kimi K2.6
LMArena Vision: reading text12551291Kimi K2.6
LMArena Vision: humor12631280Kimi K2.6
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things1232Not measuredOnly GPT-5.1 measured
LMArena Vision: creative writing12661273Kimi K2.6
LMArena Document14031451Kimi K2.6
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1 and Kimi K2.6
BenchmarkGPT-5.1Kimi 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

GPT-5.1$0.0063Fits in one request
Kimi K2.6$0.0024Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
Kimi K2.6$0.043Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits 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 GPT-5.1 and Kimi K2.6
SpecificationOpenAI GPT-5.1MoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedNovember 13, 2025April 20, 2026
Context window400K262K
Input $/Mtok$1.25$0.65
Output $/Mtok$10.00$3.41
Coding index53.344.2
Independent measurements behind it21
Cost per solved task$1.02$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than Kimi K2.6 for coding?

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 44.2 for Kimi K2.6. Pick Kimi K2.6 when output tokens cost 2.9x less, or when a solved task costs $0.35 against $1.02.

Which is cheaper, GPT-5.1 or Kimi K2.6?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; Kimi K2.6 costs $0.65 and $3.41. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and Kimi K2.6 $0.35.

Which has the bigger context window, GPT-5.1 or Kimi K2.6?

GPT-5.1, with 400K tokens against 262K.

How many benchmarks is the GPT-5.1 vs Kimi K2.6 comparison based on?

81 benchmarks have a result for both models as of October 21, 2026. GPT-5.1'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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