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GPT-5 vs Kimi K3

Updated October 21, 2026. 71 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5 Replace Kimi K3
GPT-5OpenAI
Coding
72.2
Overall
23.0
Output $/M
$10.00
1
Kimi K3Moonshot AI
Coding
61.8
Overall
43.6
Output $/M
$11.936
70
vs boards won of 71 shared

Decision reading

Pick GPT-5 for coding: it scores 72.2 on the Vibe Coding Index against 61.8 for Kimi K3.

Pick Kimi K3 when the context window is larger, 1.05M against 400K tokens, or when what matters is LMArena WebDev or AA Coding Index, where it leads.

Model AGPT-5OpenAI72.2/1003 independent benchmarks$0.39 per solved taskModel BKimi K3Moonshot AI61.8/1002 independent benchmarks$0.81 per solved task
Shared results
71
GPT-5 only
38
Kimi K3 only
46
Like-for-like categories
7 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 72.2 from 3 benchmarks, Kimi K3 61.8 from 2 benchmarks.
Widest category
Coding, 26.3 points apart on average over 10 shared benchmarks.
Widest single gap
ProofBench: GPT-5 18.0% against Kimi K3 87.0%, 69.0 points apart on a 0 to 100 scale.
Output price
GPT-5 $10.00 against Kimi K3 $11.936 per million output tokens, 1.2x apart.
Context window
GPT-5 takes 400K tokens, Kimi K3 1.05M.

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-5BarsKimi K3Ties
Coding010
Intelligence02
Reasoning013
Math06
Knowledge110
Web design07
General022
All shared boards170
CodingLike-for-likeFour of these boards feed the Vibe Coding Index010
Coding benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
Aider polyglot88.0%Not measuredOnly GPT-5 measured
SWE-bench Verified74.4%Not measuredOnly GPT-5 measured
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDev14181655Kimi K3
AA Coding Index37.876.2Kimi K3
LiveCodeBench (Vals AI)85.9%87.2%Kimi K3
SWE-bench Verified (Vals AI)69.0%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)20.1%85.0%Kimi K3
Code migration (Vals AI)Not measured16.1%Only Kimi K3 measured
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)Not measured80.9%Only Kimi K3 measured
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
LiveCodeBench (Artificial Analysis run)84.6%Not measuredOnly GPT-5 measured
SciCodeNot measured59.5%Only Kimi K3 measured
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly GPT-5 measured
Terminal-Bench49.6%Not measuredOnly GPT-5 measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
GSO-Bench6.9%Not measuredOnly GPT-5 measured
WeirdML60.7%82.6%Kimi K3
ALE-Bench807.61524.5Kimi K3
LMArena Text: coding14361508Kimi K3
LMArena Text: software and IT14201499Kimi K3
LMArena WebDev: ReactNot measured1670Only Kimi K3 measured
LMArena WebDev: HTML14271644Kimi K3
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
Neither model has a result on the other 8 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
AA Intelligence Index23.043.6Kimi K3
Epoch Capabilities Index150.0157.9Kimi K3
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index30 boards, none shared
Agentic work benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web appsNot measured1296Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1267Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1256Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1256Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1273Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench researchNot measured79.0%Only Kimi K3 measured
LiveBench browserNot measured16.0%Only Kimi K3 measured
LiveBench long agenticNot measured42.8%Only Kimi K3 measured
Finance Agent (Vals AI)Not measured53.1%Only Kimi K3 measured
Tax Agent Bench (Vals AI)Not measured33.4%Only Kimi K3 measured
Legal Research Bench (Vals AI)Not measured46.1%Only Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)Not measured66.7%Only Kimi K3 measured
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom86.5%Not measuredOnly GPT-5 measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
METR time horizons69.6%Not measuredOnly GPT-5 measured
Remote Labor Index1.7%Not measuredOnly GPT-5 measured
GDPval34.8%Not measuredOnly GPT-5 measured
BALROG32.8%Not measuredOnly GPT-5 measured
DeepResearch Bench49.6%Not measuredOnly GPT-5 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index013
Reasoning benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
GPQA Diamond85.6%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)81.5%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)85.4%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)28.5%46.9%Kimi K3
GPQA Diamond (Epoch AI run)86.2%93.1%Kimi K3
ARC-AGI65.7%94.5%Kimi K3
ARC-AGI-29.9%60.4%Kimi K3
SimpleBench56.7%60.7%Kimi K3
Chess puzzles36.0%37.0%Kimi K3
Mystery game puzzles23.0%26.0%Kimi K3
EBR-bench12.7%Not measuredOnly GPT-5 measured
VPCT66.0%Not measuredOnly GPT-5 measured
LMArena Text: hard prompts14151495Kimi K3
LMArena Text: expert14191520Kimi K3
LMArena Text: hard prompts in English14191496Kimi K3
LMArena Vision: diagrams1252Not measuredOnly GPT-5 measured
LMArena Vision: homework1278Not measuredOnly GPT-5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
AIME93.4%Not measuredOnly GPT-5 measured
MATH 500 (Vals AI)96.0%Not measuredOnly GPT-5 measured
MGSM (Vals AI)92.8%Not measuredOnly GPT-5 measured
AA Math Index94.3Not measuredOnly GPT-5 measured
AIME 2025 (Artificial Analysis run)94.3%Not measuredOnly GPT-5 measured
OTIS Mock AIME91.4%97.2%Kimi K3
FrontierMath, tiers 1 to 355.4%72.2%Kimi K3
FrontierMath, tier 422.0%39.0%Kimi K3
ProofBench18.0%87.0%Kimi K3
MATH level 598.1%Not measuredOnly GPT-5 measured
LMArena Text: math14071494Kimi K3
LMArena Text: mathematical work14051505Kimi K3
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
MMLU Pro86.5%88.0%Kimi K3
LegalBench (Vals AI)86.0%86.2%Kimi K3
CaseLaw (Vals AI)66.5%Not measuredOnly GPT-5 measured
CorpFin (Vals AI)61.1%71.6%Kimi K3
TaxEval (Vals AI)73.4%75.7%Kimi K3
MortgageTax (Vals AI)65.5%66.3%Kimi K3
MedQA (Vals AI)96.3%Not measuredOnly GPT-5 measured
MedCode (Vals AI)49.6%49.4%GPT-5
MMLU Pro (Artificial Analysis run)87.1%Not measuredOnly GPT-5 measured
SimpleQA Verified50.1%50.6%Kimi K3
GeoBench81.0%Not measuredOnly GPT-5 measured
LMArena Text: science14161508Kimi K3
LMArena Text: medicine and healthcare14131489Kimi K3
LMArena Text: legal and government14311503Kimi K3
LMArena Text: business and finance14001470Kimi K3
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
Design Arena: websites11851336Kimi K3
Design Arena: UI components11791345Kimi K3
Design Arena: game dev11851361Kimi K3
Design Arena: data viz12211350Kimi K3
Design Arena: 3D10561388Kimi K3
Design Arena: all code categories11681361Kimi K3
Design Arena: SVG11881301Kimi K3
Design Arena: ASCII art1140Not measuredOnly GPT-5 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index022
General benchmarks for GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)43.7%52.8%Kimi K3
MedScribe (Vals AI)83.7%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
IFBench73.1%Not measuredOnly GPT-5 measured
Long context reasoning (AA-LCR)78.2%88.7%Kimi K3
DTBench90.7%91.2%Kimi K3
LMCA40.0%52.7%Kimi K3
Fiction.LiveBench97.2%Not measuredOnly GPT-5 measured
Creative writing (Lech Mazur)86.0%Not measuredOnly GPT-5 measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text14061476Kimi K3
LMArena Text: instruction following13881485Kimi K3
LMArena Text: creative writing13651457Kimi K3
LMArena Vision1232Not measuredOnly GPT-5 measured
LMArena Text: English14091481Kimi K3
LMArena Text: non-English13971466Kimi K3
LMArena Text: Chinese14221529Kimi K3
LMArena Text: German14161490Kimi K3
LMArena Text: Japanese14091494Kimi K3
LMArena Text: Korean13601460Kimi K3
LMArena Text: French14091492Kimi K3
LMArena Text: Spanish13991472Kimi K3
LMArena Text: Russian14071485Kimi K3
LMArena Text: Polish14311458Kimi K3
LMArena Text: multi-turn14261489Kimi K3
LMArena Text: longer queries13991494Kimi K3
LMArena Text: writing and language13841471Kimi K3
LMArena Text: entertainment and media13791453Kimi K3
LMArena Vision: English1231Not measuredOnly GPT-5 measured
LMArena Vision: Chinese1267Not measuredOnly GPT-5 measured
LMArena Vision: reading text1246Not measuredOnly GPT-5 measured
LMArena Vision: humor1219Not measuredOnly GPT-5 measured
LMArena Vision: captioning1212Not measuredOnly GPT-5 measured
LMArena Vision: recognizing things1263Not measuredOnly GPT-5 measured
LMArena Vision: creative writing1210Not measuredOnly GPT-5 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 GPT-5 and Kimi K3
BenchmarkGPT-5Kimi K3Leader
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$0.0063Fits in one request
Kimi K3$0.0062Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

GPT-5$0.092Fits in one request
Kimi K3$0.048Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

GPT-5$0.350Fits in one request
Kimi K3$0.167Fits in one request

Kimi K3 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 and Kimi K3
SpecificationOpenAI GPT-5MoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025July 16, 2026
Context window400K1.05M
Input $/Mtok$1.25$0.239
Output $/Mtok$10.00$11.936
Coding index72.261.8
Independent measurements behind it32
Cost per solved task$0.39$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 better than Kimi K3 for coding?

Pick GPT-5 for coding: it scores 72.2 on the Vibe Coding Index against 61.8 for Kimi K3. Pick Kimi K3 when the context window is larger, 1.05M against 400K tokens, or when what matters is LMArena WebDev or AA Coding Index, where it leads.

Which is cheaper, GPT-5 or Kimi K3?

GPT-5 costs $1.25 per million input tokens and $10.00 per million output tokens; Kimi K3 costs $0.239 and $11.936. Per solved SWE-bench Verified task, GPT-5 costs $0.39 and Kimi K3 $0.81.

Which has the bigger context window, GPT-5 or Kimi K3?

Kimi K3, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5 vs Kimi K3 comparison based on?

71 benchmarks have a result for both models as of October 21, 2026. GPT-5's coding index rests on 3 independent benchmarks and Kimi K3's on 2. Where only one model has a result, the page says so instead of naming a winner.

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