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GPT-5 Mini vs Kimi K3

Kimi K3 leads GPT-5 Mini on coding, 62.3 to 34.2 on the Vibe Coding Index, and GPT-5 Mini costs 7.5x less per output token ($2.00 vs $15.00 per million). Updated October 21, 2026; 68 benchmarks have a result for both.

Replace GPT-5 Mini Replace Kimi K3
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
1
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
67
vs boards won of 68 shared

GPT-5 Mini or Kimi K3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 34.2 for GPT-5 Mini.

Pick GPT-5 Mini for output tokens 7.5x cheaper ($2.00 vs $15.00 per million) and a lower cost per solved task ($0.08 against $0.81).

Model AGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
68
GPT-5 Mini only
33
Kimi K3 only
49
Like-for-like categories
8 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
GPT-5 Mini 34.2 from 2 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Agentic work, 32.3 points apart on average over 1 shared benchmark.
Widest single gap
ProofBench: GPT-5 Mini 9.0% against Kimi K3 87.0%, 78.0 points apart on a 0 to 100 scale.
Output price
GPT-5 Mini $2.00 against Kimi K3 $15.00 per million output tokens, 7.5x apart.
Context window
GPT-5 Mini 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-5 MiniBarsKimi K3Ties
Coding07
Intelligence02
Agentic work01
Reasoning012
Math06
Knowledge110
Web design07
General022
All shared boards167
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
Coding benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
SWE-bench Verified59.8%Not measuredOnly GPT-5 Mini measured
SWE-bench Multilingual39.7%Not measuredOnly GPT-5 Mini measured
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDevNot measured1655Only Kimi K3 measured
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)86.6%87.2%Kimi K3
SWE-bench Verified (Vals AI)60.8%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)14.2%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)83.8%Not measuredOnly GPT-5 Mini measured
SciCode39.0%59.5%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)33.3%Not measuredOnly GPT-5 Mini measured
Terminal-Bench34.8%Not measuredOnly GPT-5 Mini measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML52.7%82.6%Kimi K3
ALE-BenchNot measured1524.5Only Kimi K3 measured
LMArena Text: coding14061508Kimi K3
LMArena Text: software and IT13941499Kimi K3
LMArena WebDev: ReactNot measured1670Only Kimi K3 measured
LMArena WebDev: HTMLNot measured1644Only Kimi K3 measured
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
AA Intelligence Index20.643.6Kimi K3
Epoch Capabilities Index145.3157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web appsNot measured1295Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1269Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1250Only 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 Telecom71.1%Not measuredOnly GPT-5 Mini measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2-$31$5,165Kimi K3
Berkeley Function Calling Leaderboard (BFCL)55.5%Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index012
Reasoning benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
GPQA Diamond80.3%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)78.9%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)82.8%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)21.5%46.9%Kimi K3
GPQA Diamond (Epoch AI run)75.0%93.1%Kimi K3
ARC-AGI54.3%94.5%Kimi K3
ARC-AGI-24.4%60.4%Kimi K3
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles24.0%37.0%Kimi K3
Mystery game puzzles10.0%26.0%Kimi K3
VPCT40.2%Not measuredOnly GPT-5 Mini measured
LMArena Text: hard prompts13801495Kimi K3
LMArena Text: expert13791520Kimi K3
LMArena Text: hard prompts in English13831496Kimi K3
LMArena Vision: diagrams1202Not measuredOnly GPT-5 Mini measured
LMArena Vision: homework1210Not measuredOnly GPT-5 Mini measured
Kagi LLM Benchmark70.3%Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
AIME91.5%Not measuredOnly GPT-5 Mini measured
MATH 500 (Vals AI)94.8%Not measuredOnly GPT-5 Mini measured
MGSM (Vals AI)92.6%Not measuredOnly GPT-5 Mini measured
AA Math Index90.7Not measuredOnly GPT-5 Mini measured
AIME 2025 (Artificial Analysis run)90.7%Not measuredOnly GPT-5 Mini measured
OTIS Mock AIME86.7%97.2%Kimi K3
FrontierMath, tiers 1 to 346.7%72.2%Kimi K3
FrontierMath, tier 412.2%39.0%Kimi K3
ProofBench9.0%87.0%Kimi K3
MATH level 597.8%Not measuredOnly GPT-5 Mini measured
LMArena Text: math13781494Kimi K3
LMArena Text: mathematical work13801505Kimi 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 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
MMLU Pro82.2%88.0%Kimi K3
LegalBench (Vals AI)81.8%86.2%Kimi K3
CaseLaw (Vals AI)68.5%Not measuredOnly GPT-5 Mini measured
CorpFin (Vals AI)60.2%71.6%Kimi K3
TaxEval (Vals AI)75.2%75.7%Kimi K3
MortgageTax (Vals AI)66.9%66.3%GPT-5 Mini
MedQA (Vals AI)96.1%Not measuredOnly GPT-5 Mini measured
MedCode (Vals AI)43.0%49.4%Kimi K3
MMLU Pro (Artificial Analysis run)83.7%Not measuredOnly GPT-5 Mini measured
SimpleQA Verified21.6%50.6%Kimi K3
LMArena Text: science13711508Kimi K3
LMArena Text: medicine and healthcare13801489Kimi K3
LMArena Text: legal and government13751503Kimi K3
LMArena Text: business and finance13581470Kimi K3
FACTS Benchmark Suite38.6%Not measuredOnly GPT-5 Mini measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for GPT-5 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi K3Leader
Design Arena: websites11251335Kimi K3
Design Arena: UI components11061344Kimi K3
Design Arena: game dev11301359Kimi K3
Design Arena: data viz11301351Kimi K3
Design Arena: 3D10371388Kimi K3
Design Arena: all code categories11151360Kimi K3
Design Arena: SVG10911302Kimi K3
Design Arena: ASCII art1125Not measuredOnly GPT-5 Mini 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 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi 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)43.0%52.8%Kimi K3
MedScribe (Vals AI)80.6%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
IFBench75.4%Not measuredOnly GPT-5 Mini measured
Long context reasoning (AA-LCR)72.3%88.7%Kimi K3
DTBench80.5%91.2%Kimi K3
LMCA34.2%52.7%Kimi K3
Fiction.LiveBench69.4%Not measuredOnly GPT-5 Mini measured
Creative writing (Lech Mazur)83.1%Not measuredOnly GPT-5 Mini measured
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text13731476Kimi K3
LMArena Text: instruction following13571485Kimi K3
LMArena Text: creative writing13251457Kimi K3
LMArena Vision1202Not measuredOnly GPT-5 Mini measured
LMArena Text: English13791481Kimi K3
LMArena Text: non-English13631466Kimi K3
LMArena Text: Chinese13861529Kimi K3
LMArena Text: German13661490Kimi K3
LMArena Text: Japanese13411494Kimi K3
LMArena Text: Korean13081460Kimi K3
LMArena Text: French13861492Kimi K3
LMArena Text: Spanish13541472Kimi K3
LMArena Text: Russian13621485Kimi K3
LMArena Text: Polish13781458Kimi K3
LMArena Text: multi-turn13631489Kimi K3
LMArena Text: longer queries13551494Kimi K3
LMArena Text: writing and language13441471Kimi K3
LMArena Text: entertainment and media13401453Kimi K3
LMArena Vision: English1216Not measuredOnly GPT-5 Mini measured
LMArena Vision: Chinese1214Not measuredOnly GPT-5 Mini measured
LMArena Vision: reading text1199Not measuredOnly GPT-5 Mini measured
LMArena Vision: humor1205Not measuredOnly GPT-5 Mini measured
LMArena Vision: captioning1217Not measuredOnly GPT-5 Mini measured
LMArena Vision: recognizing things1226Not measuredOnly GPT-5 Mini measured
LMArena Vision: creative writing1181Not measuredOnly GPT-5 Mini 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 Mini and Kimi K3
BenchmarkGPT-5 MiniKimi 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 Mini$0.0013Fits in one request
Kimi K3$0.011Fits in one request

GPT-5 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5 Mini$0.018Fits in one request
Kimi K3$0.195Fits in one request

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5 Mini$0.070Fits in one request
Kimi K3$0.750Fits in one request

GPT-5 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 GPT-5 Mini and Kimi K3
SpecificationOpenAI GPT-5 MiniMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025July 16, 2026
Context window400K1.05M
Input $/Mtok$0.25$3.00
Output $/Mtok$2.00$15.00
Coding index34.262.3
Independent measurements behind it26
Cost per solved task$0.08$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 Mini better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 34.2 for GPT-5 Mini. Pick GPT-5 Mini for output tokens 7.5x cheaper ($2.00 vs $15.00 per million) and a lower cost per solved task ($0.08 against $0.81).

Which is cheaper, GPT-5 Mini or Kimi K3?

GPT-5 Mini costs $0.25 per million input tokens and $2.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, GPT-5 Mini costs $0.08 and Kimi K3 $0.81.

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

Kimi K3, with 1.05M tokens against 400K.

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

68 benchmarks have a result for both models as of October 21, 2026. GPT-5 Mini's coding index rests on 2 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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