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Kimi K3 vs o3 Mini

Kimi K3 leads o3 Mini on the Artificial Analysis Intelligence Index, 43.6 to 12.5, and o3 Mini costs 3.4x less per output token ($4.40 vs $15.00 per million). Updated October 22, 2026; 53 benchmarks have a result for both.

Replace Kimi K3 Replace o3 Mini
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
53
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
0
vs boards won of 53 shared

Kimi K3 or o3 Mini: which to pick

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding.

Pick o3 Mini for output tokens 3.4x cheaper ($4.40 vs $15.00 per million).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
53
Kimi K3 only
64
o3 Mini only
18
Like-for-like categories
6 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
Kimi K3 62.3 from 6 benchmarks, o3 Mini not benchmarked.
Widest category
Math, 29.4 points apart on average over 5 shared benchmarks.
Widest single gap
ARC-AGI: Kimi K3 94.5% against o3 Mini 34.5%, 60.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against o3 Mini $4.40 per million output tokens, 3.4x apart.
Context window
Kimi K3 takes 1.05M tokens, o3 Mini 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 K3Barso3 MiniTies
Coding50
Intelligence20
Reasoning120
Math50
Knowledge90
General200
All shared boards530
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
Coding benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LiveBench coding59.3%Not measuredOnly Kimi K3 measured
LMArena WebDev1655Not measuredOnly Kimi K3 measured
AA Coding Index76.2Not measuredOnly Kimi K3 measured
LiveCodeBench (Vals AI)87.2%71.5%Kimi K3
SWE-bench Verified (Vals AI)93.4%Not measuredOnly Kimi K3 measured
Terminal-Bench 4 (Vals AI)17.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench (Vals AI)85.0%Not measuredOnly Kimi K3 measured
Code migration (Vals AI)16.1%Not measuredOnly Kimi K3 measured
ProgramBench (Vals AI)2.0%Not measuredOnly Kimi K3 measured
IOI (Vals AI)48.9%Not measuredOnly Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)80.9%Not measuredOnly Kimi K3 measured
SWE-bench Multimodal (Vals AI)44.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)18.2%Not measuredOnly Kimi K3 measured
CyberBench (Vals AI)75.2%Not measuredOnly Kimi K3 measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCode59.5%42.8%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)Not measured6.8%Only o3 Mini measured
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdML82.6%43.7%Kimi K3
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench1524.5Not measuredOnly Kimi K3 measured
LMArena Text: coding15081378Kimi K3
LMArena Text: software and IT14991364Kimi K3
LMArena WebDev: React1670Not measuredOnly Kimi K3 measured
LMArena WebDev: HTML1644Not measuredOnly Kimi K3 measured
LMArena WebDev: from an image1579Not measuredOnly Kimi K3 measured
SciCodeNot measured7.7%Only o3 Mini measured
Neither model has a result on the other 7 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
AA Intelligence Index43.612.5Kimi K3
Epoch Capabilities Index157.9140.2Kimi K3
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index25 boards, none shared
Agentic work benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
AA Agentic Index50.0Not measuredOnly Kimi K3 measured
Design Arena: agents building web apps1295Not measuredOnly Kimi K3 measured
Design Arena: agents building full-stack apps1315Not measuredOnly Kimi K3 measured
Design Arena: agents building mobile apps1269Not measuredOnly Kimi K3 measured
Design Arena: agents building Android apps1253Not measuredOnly Kimi K3 measured
Design Arena: agents building Godot games1223Not measuredOnly Kimi K3 measured
Design Arena: agents building games1252Not measuredOnly Kimi K3 measured
Design Arena: HTML slides1206Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides1247Not measuredOnly Kimi K3 measured
Design Arena: spreadsheets1070Not measuredOnly Kimi K3 measured
LiveBench research79.0%Not measuredOnly Kimi K3 measured
LiveBench browser16.0%Not measuredOnly Kimi K3 measured
LiveBench long agentic42.8%Not measuredOnly Kimi K3 measured
Finance Agent (Vals AI)53.1%Not measuredOnly Kimi K3 measured
Tax Agent Bench (Vals AI)33.4%Not measuredOnly Kimi K3 measured
Legal Research Bench (Vals AI)46.1%Not measuredOnly Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%Not measuredOnly Kimi K3 measured
BioMysteryBench (Vals AI)72.6%Not measuredOnly Kimi K3 measured
Terminal-Bench-Science (Vals AI)1.4%Not measuredOnly Kimi K3 measured
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
τ²-Bench TelecomNot measured31.3%Only o3 Mini measured
APEX-Agents47.8%Not measuredOnly Kimi K3 measured
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly Kimi K3 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
GPQA Diamond92.9%75.5%Kimi K3
LiveBench reasoning90.7%Not measuredOnly Kimi K3 measured
MMMU Pro (Vals AI)88.2%Not measuredOnly Kimi K3 measured
GPQA Diamond (Artificial Analysis run)93.5%77.3%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%12.0%Kimi K3
GPQA Diamond (Epoch AI run)93.1%77.0%Kimi K3
ARC-AGI94.5%34.5%Kimi K3
ARC-AGI-260.4%3.0%Kimi K3
SimpleBench60.7%22.8%Kimi K3
Chess puzzles37.0%15.0%Kimi K3
Mystery game puzzles26.0%7.0%Kimi K3
LMArena Text: hard prompts14951365Kimi K3
LMArena Text: expert15201364Kimi K3
LMArena Text: hard prompts in English14961375Kimi K3
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIME97.2%76.9%Kimi K3
FrontierMath, tiers 1 to 372.2%18.6%Kimi K3
FrontierMath, tier 439.0%0.0%Kimi K3
ProofBench87.0%Not measuredOnly Kimi K3 measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14941396Kimi K3
LMArena Text: mathematical work15051399Kimi K3
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
MMLU Pro88.0%78.7%Kimi K3
LegalBench (Vals AI)86.2%71.5%Kimi K3
CorpFin (Vals AI)71.6%45.3%Kimi K3
TaxEval (Vals AI)75.7%69.4%Kimi K3
MortgageTax (Vals AI)66.3%Not measuredOnly Kimi K3 measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MedCode (Vals AI)49.4%Not measuredOnly Kimi K3 measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA Verified50.6%15.3%Kimi K3
LMArena Text: science15081339Kimi K3
LMArena Text: medicine and healthcare14891330Kimi K3
LMArena Text: legal and government15031328Kimi K3
LMArena Text: business and finance14701313Kimi K3
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
Design Arena: websites1334Not measuredOnly Kimi K3 measured
Design Arena: UI components1341Not measuredOnly Kimi K3 measured
Design Arena: game dev1358Not measuredOnly Kimi K3 measured
Design Arena: data viz1351Not measuredOnly Kimi K3 measured
Design Arena: 3D1387Not measuredOnly Kimi K3 measured
Design Arena: all code categories1360Not measuredOnly Kimi K3 measured
Design Arena: SVG1302Not measuredOnly Kimi K3 measured
LiveBench design77.2%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%Not measuredOnly Kimi K3 measured
Public Benefits Bench (Vals AI)68.2%Not measuredOnly Kimi K3 measured
SAGE (Vals AI)52.8%Not measuredOnly Kimi K3 measured
MedScribe (Vals AI)88.0%Not measuredOnly Kimi K3 measured
Vals Multimodal Index73.4%Not measuredOnly Kimi K3 measured
IFBenchNot measured67.1%Only o3 Mini measured
Long context reasoning (AA-LCR)88.7%43.0%Kimi K3
DTBench91.2%68.8%Kimi K3
LMCA52.7%19.0%Kimi K3
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761337Kimi K3
LMArena Text: instruction following14851337Kimi K3
LMArena Text: creative writing14571286Kimi K3
LMArena Text: English14811351Kimi K3
LMArena Text: non-English14661319Kimi K3
LMArena Text: Chinese15291379Kimi K3
LMArena Text: German14901303Kimi K3
LMArena Text: Japanese14941286Kimi K3
LMArena Text: Korean14601313Kimi K3
LMArena Text: French14921334Kimi K3
LMArena Text: Spanish14721321Kimi K3
LMArena Text: Russian14851304Kimi K3
LMArena Text: Polish14581294Kimi K3
LMArena Text: multi-turn14891320Kimi K3
LMArena Text: longer queries14941343Kimi K3
LMArena Text: writing and language14711313Kimi K3
LMArena Text: entertainment and media14531283Kimi K3
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and o3 Mini
BenchmarkKimi K3o3 MiniLeader
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 K3$0.011Fits in one request
o3 Mini$0.0033Fits in one request

o3 Mini costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
o3 Mini$0.068Fits in one request

o3 Mini costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
o3 Mini$0.264Exceeds the context window

o3 Mini 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 K3 and o3 Mini
SpecificationMoonshotAI Kimi K3OpenAI o3 Mini
MakerMoonshot AIOpenAI
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026January 31, 2025
Context window1.05M200K
Input $/Mtok$3.00$1.10
Output $/Mtok$15.00$4.40
Coding index62.3Not benchmarked
Independent measurements behind it60
Cost per solved task$0.81Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than o3 Mini for coding?

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; o3 Mini has none, so the two cannot be ranked on coding. Pick o3 Mini for output tokens 3.4x cheaper ($4.40 vs $15.00 per million).

Which is cheaper, Kimi K3 or o3 Mini?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Kimi K3 or o3 Mini?

Kimi K3, with 1.05M tokens against 200K.

How many benchmarks is the Kimi K3 vs o3 Mini comparison based on?

53 benchmarks have a result for both models as of October 22, 2026. Kimi K3's coding index rests on 6 independent benchmarks and o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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