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Kimi K3 vs Mistral Medium 3.1

Kimi K3 leads Mistral Medium 3.1 on the Artificial Analysis Intelligence Index, 43.6 to 9.2, and Mistral Medium 3.1 costs 7.5x less per output token ($2.00 vs $15.00 per million). Updated October 21, 2026; 52 benchmarks have a result for both.

Replace Kimi K3 Replace Mistral Medium 3.1
Kimi K3Moonshot AI
Coding
62.3
Overall
43.6
Output $/M
$15.00
52
Mistral Medium 3.1Mistral AI
Coding
No data
Overall
9.2
Output $/M
$2.00
0
vs boards won of 52 shared

Kimi K3 or Mistral Medium 3.1: which to pick

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Mistral Medium 3.1 has none, so the two cannot be ranked on coding.

Pick Mistral Medium 3.1 for output tokens 7.5x cheaper ($2.00 vs $15.00 per million).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BMistral Medium 3.1Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
52
Kimi K3 only
65
Mistral Medium 3.1 only
22
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
Kimi K3 62.3 from 6 benchmarks, Mistral Medium 3.1 not benchmarked.
Widest category
Agentic work, 48.1 points apart on average over 1 shared benchmark.
Widest single gap
AA Coding Index: Kimi K3 76.2 against Mistral Medium 3.1 20.5, 55.7 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Mistral Medium 3.1 $2.00 per million output tokens, 7.5x apart.
Context window
Kimi K3 takes 1.05M tokens, Mistral Medium 3.1 131K.

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 K3BarsMistral Medium 3.1Ties
Coding60
Intelligence10
Agentic work10
Reasoning60
Math20
Knowledge90
Web design70
General200
All shared boards520
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
Coding benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
LiveBench coding59.3%Not measuredOnly Kimi K3 measured
LMArena WebDev1655Not measuredOnly Kimi K3 measured
AA Coding Index76.220.5Kimi K3
LiveCodeBench (Vals AI)87.2%44.8%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 measured40.6%Only Mistral Medium 3.1 measured
SciCode59.5%32.4%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)Not measured10.6%Only Mistral Medium 3.1 measured
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
WeirdML82.6%Not measuredOnly Kimi K3 measured
ALE-Bench1524.5210.2Kimi K3
LMArena Text: coding15081433Kimi K3
LMArena Text: software and IT14991436Kimi K3
LMArena WebDev: React1670Not measuredOnly Kimi K3 measured
LMArena WebDev: HTML1644Not measuredOnly Kimi K3 measured
LMArena WebDev: from an image1579Not measuredOnly Kimi K3 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
AA Intelligence Index43.69.2Kimi K3
Epoch Capabilities Index157.9Not measuredOnly Kimi K3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
AA Agentic Index50.01.9Kimi K3
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 apps1250Not 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 slides1256Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides1273Not measuredOnly Kimi K3 measured
Design Arena: spreadsheets1058Not 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 measured40.6%Only Mistral Medium 3.1 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 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index60
Reasoning benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
GPQA Diamond92.9%Not measuredOnly Kimi K3 measured
LiveBench reasoning90.7%Not measuredOnly Kimi K3 measured
MMMU Pro (Vals AI)88.2%63.0%Kimi K3
GPQA Diamond (Artificial Analysis run)93.5%58.8%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%4.7%Kimi K3
GPQA Diamond (Epoch AI run)93.1%Not measuredOnly Kimi K3 measured
ARC-AGI94.5%Not measuredOnly Kimi K3 measured
ARC-AGI-260.4%Not measuredOnly Kimi K3 measured
SimpleBench60.7%Not measuredOnly Kimi K3 measured
Chess puzzles37.0%Not measuredOnly Kimi K3 measured
Mystery game puzzles26.0%Not measuredOnly Kimi K3 measured
LMArena Text: hard prompts14951426Kimi K3
LMArena Text: expert15201408Kimi K3
LMArena Text: hard prompts in English14961435Kimi K3
LMArena Vision: diagramsNot measured1175Only Mistral Medium 3.1 measured
LMArena Vision: homeworkNot measured1165Only Mistral Medium 3.1 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
AIMENot measured42.3%Only Mistral Medium 3.1 measured
MATH 500 (Vals AI)Not measured87.0%Only Mistral Medium 3.1 measured
MGSM (Vals AI)Not measured90.9%Only Mistral Medium 3.1 measured
AA Math IndexNot measured38.3Only Mistral Medium 3.1 measured
AIME 2025 (Artificial Analysis run)Not measured38.3%Only Mistral Medium 3.1 measured
OTIS Mock AIME97.2%Not measuredOnly Kimi K3 measured
FrontierMath, tiers 1 to 372.2%Not measuredOnly Kimi K3 measured
FrontierMath, tier 439.0%Not measuredOnly Kimi K3 measured
ProofBench87.0%Not measuredOnly Kimi K3 measured
LMArena Text: math14941408Kimi K3
LMArena Text: mathematical work15051412Kimi K3
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
MMLU Pro88.0%75.3%Kimi K3
LegalBench (Vals AI)86.2%62.0%Kimi K3
CorpFin (Vals AI)71.6%50.7%Kimi K3
TaxEval (Vals AI)75.7%70.3%Kimi K3
MortgageTax (Vals AI)66.3%36.5%Kimi K3
MedQA (Vals AI)Not measured78.2%Only Mistral Medium 3.1 measured
MedCode (Vals AI)49.4%Not measuredOnly Kimi K3 measured
MMLU Pro (Artificial Analysis run)Not measured68.3%Only Mistral Medium 3.1 measured
SimpleQA Verified50.6%Not measuredOnly Kimi K3 measured
LMArena Text: science15081444Kimi K3
LMArena Text: medicine and healthcare14891449Kimi K3
LMArena Text: legal and government15031439Kimi K3
LMArena Text: business and finance14701418Kimi K3
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
Design Arena: websites13351133Kimi K3
Design Arena: UI components13441100Kimi K3
Design Arena: game dev13591074Kimi K3
Design Arena: data viz13511144Kimi K3
Design Arena: 3D13881081Kimi K3
Design Arena: all code categories13601120Kimi K3
Design Arena: SVG1302993Kimi K3
Design Arena: ASCII artNot measured997Only Mistral Medium 3.1 measured
LiveBench design77.2%Not measuredOnly Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
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 measured39.8%Only Mistral Medium 3.1 measured
Long context reasoning (AA-LCR)88.7%42.7%Kimi K3
DTBench91.2%67.5%Kimi K3
LMCA52.7%19.1%Kimi K3
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761424Kimi K3
LMArena Text: instruction following14851398Kimi K3
LMArena Text: creative writing14571391Kimi K3
LMArena VisionNot measured1172Only Mistral Medium 3.1 measured
LMArena Text: English14811438Kimi K3
LMArena Text: non-English14661408Kimi K3
LMArena Text: Chinese15291447Kimi K3
LMArena Text: German14901432Kimi K3
LMArena Text: Japanese14941379Kimi K3
LMArena Text: Korean14601380Kimi K3
LMArena Text: French14921460Kimi K3
LMArena Text: Spanish14721433Kimi K3
LMArena Text: Russian14851411Kimi K3
LMArena Text: Polish14581430Kimi K3
LMArena Text: multi-turn14891418Kimi K3
LMArena Text: longer queries14941406Kimi K3
LMArena Text: writing and language14711395Kimi K3
LMArena Text: entertainment and media14531390Kimi K3
LMArena Vision: EnglishNot measured1179Only Mistral Medium 3.1 measured
LMArena Vision: ChineseNot measured1190Only Mistral Medium 3.1 measured
LMArena Vision: reading textNot measured1175Only Mistral Medium 3.1 measured
LMArena Vision: humorNot measured1168Only Mistral Medium 3.1 measured
LMArena Vision: captioningNot measured1145Only Mistral Medium 3.1 measured
LMArena Vision: recognizing thingsNot measured1147Only Mistral Medium 3.1 measured
LMArena Vision: creative writingNot measured1200Only Mistral Medium 3.1 measured
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and Mistral Medium 3.1
BenchmarkKimi K3Mistral Medium 3.1Leader
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
Mistral Medium 3.1$0.0014Fits in one request

Mistral Medium 3.1 costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Mistral Medium 3.1$0.026Fits in one request

Mistral Medium 3.1 costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Mistral Medium 3.1$0.100Exceeds the context window

Mistral Medium 3.1 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 Mistral Medium 3.1
SpecificationMoonshotAI Kimi K3Mistral Medium 3.1
MakerMoonshot AIMistral AI
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026August 13, 2025
Context window1.05M131K
Input $/Mtok$3.00$0.40
Output $/Mtok$15.00$2.00
Coding index62.3Not benchmarked
Independent measurements behind it60
Cost per solved task$0.81Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Mistral Medium 3.1 for coding?

Only Kimi K3 has a coding score, 62.3 on the Vibe Coding Index; Mistral Medium 3.1 has none, so the two cannot be ranked on coding. Pick Mistral Medium 3.1 for output tokens 7.5x cheaper ($2.00 vs $15.00 per million).

Which is cheaper, Kimi K3 or Mistral Medium 3.1?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Mistral Medium 3.1 costs $0.40 and $2.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Kimi K3 or Mistral Medium 3.1?

Kimi K3, with 1.05M tokens against 131K.

How many benchmarks is the Kimi K3 vs Mistral Medium 3.1 comparison based on?

52 benchmarks have a result for both models as of October 21, 2026. Kimi K3's coding index rests on 6 independent benchmarks and Mistral Medium 3.1's on 0. Where only one model has a result, the page says so instead of naming a winner.

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