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Kimi K2.6 vs o3

Updated October 21, 2026. 70 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Kimi K2.6 Replace o3
Kimi K2.6Moonshot AI
Coding
44.2
Overall
27.0
Output $/M
$3.41
64
o3OpenAI
Coding
70.7
Overall
20.2
Output $/M
$8.00
6
vs boards won of 70 shared

Decision reading

Pick o3 for coding: it scores 70.7 on the Vibe Coding Index against 44.2 for Kimi K2.6.

Pick Kimi K2.6 when output tokens cost 2.3x less, or when a solved task costs $0.35 against $0.571.

Model AKimi K2.6Moonshot AI44.2/1001 independent benchmark$0.35 per solved taskModel Bo3OpenAI70.7/1002 independent benchmarks$0.571 per solved task
Shared results
70
Kimi K2.6 only
39
o3 only
27
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
Kimi K2.6 44.2 from 1 benchmark, o3 70.7 from 2 benchmarks.
Widest category
Web design, 25.0 points apart on average over 5 shared benchmarks.
Widest single gap
Design Arena: all code categories: Kimi K2.6 1272 against o3 1021, 31.4 points apart on a 0 to 100 scale.
Output price
Kimi K2.6 $3.41 against o3 $8.00 per million output tokens, 2.3x apart.
Context window
Kimi K2.6 takes 262K tokens, o3 200K.

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
CategoryKimi K2.6Barso3Ties
Coding60
Intelligence20
Agentic work10
Reasoning102
Math40
Knowledge92
Web design50
General272
All shared boards646
CodingLike-for-likeFour of these boards feed the Vibe Coding Index60
Coding benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
Aider polyglotNot measured81.3%Only o3 measured
SWE-bench VerifiedNot measured58.4%Only o3 measured
SWE-bench MultimodalNot measured36.0%Only o3 measured
LMArena WebDev1509Not measuredOnly Kimi K2.6 measured
AA Coding Index61.8Not measuredOnly Kimi K2.6 measured
LiveCodeBench (Vals AI)86.8%83.9%Kimi K2.6
SWE-bench Verified (Vals AI)76.2%Not measuredOnly Kimi K2.6 measured
Vibe Code Bench (Vals AI)37.9%Not measuredOnly Kimi K2.6 measured
Code migration (Vals AI)27.8%Not measuredOnly Kimi K2.6 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Kimi K2.6 measured
Terminal-Bench 2.1 (Vals AI)53.6%Not measuredOnly Kimi K2.6 measured
LiveCodeBench (Artificial Analysis run)Not measured80.8%Only o3 measured
SciCode51.5%Not measuredOnly Kimi K2.6 measured
Terminal-Bench Hard (Artificial Analysis run)43.9%37.1%Kimi K2.6
GSO-BenchNot measured8.8%Only o3 measured
WeirdML55.9%52.4%Kimi K2.6
ALE-Bench1092.7933.5Kimi K2.6
LMArena Text: coding14891407Kimi K2.6
LMArena Text: software and IT14841415Kimi K2.6
LMArena WebDev: React1505Not measuredOnly Kimi K2.6 measured
LMArena WebDev: HTML1485Not measuredOnly Kimi K2.6 measured
LMArena WebDev: from an image1521Not measuredOnly Kimi K2.6 measured
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 Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
AA Intelligence Index27.020.2Kimi K2.6
Epoch Capabilities Index150.9146.7Kimi K2.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
AA Agentic Index20.5Not measuredOnly Kimi K2.6 measured
Design Arena: agents building web apps1268Not measuredOnly Kimi K2.6 measured
Design Arena: agents building full-stack apps1155Not measuredOnly Kimi K2.6 measured
Design Arena: agents building mobile apps1156Not measuredOnly Kimi K2.6 measured
Design Arena: agents building Android apps1166Not measuredOnly Kimi K2.6 measured
Design Arena: agents building Godot games1120Not measuredOnly Kimi K2.6 measured
Design Arena: agents building games1141Not measuredOnly Kimi K2.6 measured
Design Arena: HTML slides1184Not measuredOnly Kimi K2.6 measured
Design Arena: PowerPoint slides1128Not measuredOnly Kimi K2.6 measured
Design Arena: spreadsheets1276Not measuredOnly Kimi K2.6 measured
Finance Agent (Vals AI)44.9%Not measuredOnly Kimi K2.6 measured
Tax Agent Bench (Vals AI)12.4%Not measuredOnly Kimi K2.6 measured
Legal Research Bench (Vals AI)15.9%Not measuredOnly Kimi K2.6 measured
Excel Modeling Benchmark (Vals AI)57.9%Not measuredOnly Kimi K2.6 measured
τ²-Bench Telecom95.9%80.7%Kimi K2.6
METR time horizonsNot measured65.4%Only o3 measured
GDPvalNot measured30.8%Only o3 measured
OSWorld 2.04.6%Not measuredOnly Kimi K2.6 measured
DeepResearch BenchNot measured45.2%Only o3 measured
OSWorldNot measured23.0%Only o3 measured
Vending-Bench 2$6,205Not measuredOnly Kimi K2.6 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index102
Reasoning benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
GPQA Diamond89.1%84.1%Kimi K2.6
MMMU Pro (Vals AI)86.3%80.4%Kimi K2.6
GPQA Diamond (Artificial Analysis run)91.1%82.7%Kimi K2.6
Humanity's Last Exam (Artificial Analysis run)37.5%20.1%Kimi K2.6
GPQA Diamond (Epoch AI run)90.8%81.8%Kimi K2.6
ARC-AGINot measured60.8%Only o3 measured
ARC-AGI-2Not measured6.5%Only o3 measured
SimpleBenchNot measured53.1%Only o3 measured
Chess puzzles20.0%37.0%o3
Mystery game puzzles18.0%29.0%o3
EBR-bench2.4%Not measuredOnly Kimi K2.6 measured
VPCTNot measured52.0%Only o3 measured
LMArena Text: hard prompts14701402Kimi K2.6
LMArena Text: expert14911402Kimi K2.6
LMArena Text: hard prompts in English14711411Kimi K2.6
LMArena Vision: diagrams12981220Kimi K2.6
LMArena Vision: homework13101234Kimi K2.6
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
AIMENot measured85.3%Only o3 measured
MATH 500 (Vals AI)Not measured94.6%Only o3 measured
MGSM (Vals AI)Not measured91.8%Only o3 measured
AA Math IndexNot measured88.3Only o3 measured
AIME 2025 (Artificial Analysis run)Not measured88.3%Only o3 measured
OTIS Mock AIME96.1%84.4%Kimi K2.6
FrontierMath, tiers 1 to 357.2%33.3%Kimi K2.6
FrontierMath, tier 425.6%Not measuredOnly Kimi K2.6 measured
ProofBench16.0%Not measuredOnly Kimi K2.6 measured
MATH level 5Not measured97.8%Only o3 measured
LMArena Text: math14741426Kimi K2.6
LMArena Text: mathematical work14801423Kimi K2.6
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index92
Knowledge benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
MMLU Pro87.6%85.6%Kimi K2.6
LegalBench (Vals AI)84.7%83.8%Kimi K2.6
CaseLaw (Vals AI)61.2%Not measuredOnly Kimi K2.6 measured
CorpFin (Vals AI)66.7%59.7%Kimi K2.6
TaxEval (Vals AI)74.7%74.6%Kimi K2.6
MortgageTax (Vals AI)65.8%65.7%Kimi K2.6
MedQA (Vals AI)Not measured96.1%Only o3 measured
MedCode (Vals AI)40.1%47.3%o3
MMLU Pro (Artificial Analysis run)Not measured85.3%Only o3 measured
SimpleQA Verified34.9%49.4%o3
GeoBenchNot measured74.0%Only o3 measured
LMArena Text: science14681429Kimi K2.6
LMArena Text: medicine and healthcare14571448Kimi K2.6
LMArena Text: legal and government14621428Kimi K2.6
LMArena Text: business and finance14451393Kimi K2.6
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index50
Web design benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
Design Arena: websites12691036Kimi K2.6
Design Arena: UI components12661016Kimi K2.6
Design Arena: game dev12511034Kimi K2.6
Design Arena: data viz12491200Kimi K2.6
Design Arena: 3D1268Not measuredOnly Kimi K2.6 measured
Design Arena: all code categories12721021Kimi K2.6
Design Arena: SVG1181Not measuredOnly Kimi K2.6 measured
Design Arena: ASCII art1164Not measuredOnly Kimi K2.6 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index272
General benchmarks for Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
Public Benefits Bench (Vals AI)56.6%Not measuredOnly Kimi K2.6 measured
SAGE (Vals AI)50.2%41.8%Kimi K2.6
MedScribe (Vals AI)78.2%76.7%Kimi K2.6
Vals Multimodal Index56.4%Not measuredOnly Kimi K2.6 measured
IFBench76.0%71.4%Kimi K2.6
Long context reasoning (AA-LCR)81.0%74.7%Kimi K2.6
DTBench90.9%84.8%Kimi K2.6
LMCA37.3%39.7%o3
Fiction.LiveBenchNot measured88.9%Only o3 measured
Creative writing (Lech Mazur)Not measured83.9%Only o3 measured
CL-benchNot measured17.8%Only o3 measured
Furniture assembly21.7%Not measuredOnly Kimi K2.6 measured
ExploitBench18.4%Not measuredOnly Kimi K2.6 measured
LMArena Text14551410Kimi K2.6
LMArena Text: instruction following14511368Kimi K2.6
LMArena Text: creative writing14341359Kimi K2.6
LMArena Vision12821214Kimi K2.6
LMArena Text: English14601417Kimi K2.6
LMArena Text: non-English14461401Kimi K2.6
LMArena Text: Chinese15201437Kimi K2.6
LMArena Text: German14511420Kimi K2.6
LMArena Text: Japanese14431403Kimi K2.6
LMArena Text: Korean14271370Kimi K2.6
LMArena Text: French14711430Kimi K2.6
LMArena Text: Spanish14641395Kimi K2.6
LMArena Text: Russian14461406Kimi K2.6
LMArena Text: Polish14381438o3
LMArena Text: multi-turn14531405Kimi K2.6
LMArena Text: longer queries14681372Kimi K2.6
LMArena Text: writing and language14391372Kimi K2.6
LMArena Text: entertainment and media14281373Kimi K2.6
LMArena Vision: English12871221Kimi K2.6
LMArena Vision: Chinese13461237Kimi K2.6
LMArena Vision: reading text12911218Kimi K2.6
LMArena Vision: humor12801222Kimi K2.6
LMArena Vision: captioningNot measured1210Only o3 measured
LMArena Vision: recognizing thingsNot measured1234Only o3 measured
LMArena Vision: creative writing12731201Kimi K2.6
LMArena Document1451Not measuredOnly Kimi K2.6 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 Kimi K2.6 and o3
BenchmarkKimi K2.6o3Leader
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

Kimi K2.6$0.0024Fits in one request
o3$0.0060Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

Kimi K2.6$0.043Fits in one request
o3$0.124Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

Kimi K2.6$0.164Fits in one request
o3$0.480Exceeds the context window

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 Kimi K2.6 and o3
SpecificationMoonshotAI Kimi K2.6OpenAI o3
MakerMoonshot AIOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 20, 2026April 16, 2025
Context window262K200K
Input $/Mtok$0.65$2.00
Output $/Mtok$3.41$8.00
Coding index44.270.7
Independent measurements behind it12
Cost per solved task$0.35$0.571
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K2.6 better than o3 for coding?

Pick o3 for coding: it scores 70.7 on the Vibe Coding Index against 44.2 for Kimi K2.6. Pick Kimi K2.6 when output tokens cost 2.3x less, or when a solved task costs $0.35 against $0.571.

Which is cheaper, Kimi K2.6 or o3?

Kimi K2.6 costs $0.65 per million input tokens and $3.41 per million output tokens; o3 costs $2.00 and $8.00. Per solved SWE-bench Verified task, Kimi K2.6 costs $0.35 and o3 $0.571.

Which has the bigger context window, Kimi K2.6 or o3?

Kimi K2.6, with 262K tokens against 200K.

How many benchmarks is the Kimi K2.6 vs o3 comparison based on?

70 benchmarks have a result for both models as of October 21, 2026. Kimi K2.6's coding index rests on 1 independent benchmark and o3's on 2. Where only one model has a result, the page says so instead of naming a winner.

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