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Kimi K2.6 vs Mistral Medium 3.1

Kimi K2.6 leads Mistral Medium 3.1 on the Artificial Analysis Intelligence Index, 27.0 to 9.2, and Mistral Medium 3.1 costs 2.0x less per output token ($2.00 vs $4.00 per million). Updated October 21, 2026; 64 benchmarks have a result for both.

Replace Kimi K2.6 Replace Mistral Medium 3.1
Kimi K2.6Moonshot AI
Coding
52.1
Overall
27.0
Output $/M
$4.00
64
Mistral Medium 3.1Mistral AI
Coding
No data
Overall
9.2
Output $/M
$2.00
0
vs boards won of 64 shared

Kimi K2.6 or Mistral Medium 3.1: which to pick

Only Kimi K2.6 has a coding score, 52.1 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 2.0x cheaper ($2.00 vs $4.00 per million).

Model AKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved taskModel BMistral Medium 3.1Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
64
Kimi K2.6 only
45
Mistral Medium 3.1 only
10
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 K2.6 52.1 from 3 benchmarks, Mistral Medium 3.1 not benchmarked.
Widest category
Agentic work, 36.9 points apart on average over 2 shared benchmarks.
Widest single gap
τ²-Bench Telecom: Kimi K2.6 95.9% against Mistral Medium 3.1 40.6%, 55.3 points apart on a 0 to 100 scale.
Output price
Kimi K2.6 $4.00 against Mistral Medium 3.1 $2.00 per million output tokens, 2.0x apart.
Context window
Kimi K2.6 takes 262K 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 K2.6BarsMistral Medium 3.1Ties
Coding70
Intelligence10
Agentic work20
Reasoning80
Math20
Knowledge90
Web design80
General270
All shared boards640
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
Coding benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
LMArena WebDev1509Not measuredOnly Kimi K2.6 measured
AA Coding Index61.820.5Kimi K2.6
LiveCodeBench (Vals AI)86.8%44.8%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 measured40.6%Only Mistral Medium 3.1 measured
SciCode51.5%32.4%Kimi K2.6
Terminal-Bench Hard (Artificial Analysis run)43.9%10.6%Kimi K2.6
WeirdML55.9%Not measuredOnly Kimi K2.6 measured
ALE-Bench1092.7210.2Kimi K2.6
LMArena Text: coding14891433Kimi K2.6
LMArena Text: software and IT14841436Kimi 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 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
AA Intelligence Index27.09.2Kimi K2.6
Epoch Capabilities Index150.9Not measuredOnly Kimi K2.6 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
AA Agentic Index20.51.9Kimi K2.6
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 apps1157Not measuredOnly Kimi K2.6 measured
Design Arena: agents building Android apps1160Not 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%40.6%Kimi K2.6
OSWorld 2.04.6%Not measuredOnly Kimi K2.6 measured
Vending-Bench 2$6,205Not measuredOnly Kimi K2.6 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
Reasoning benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
GPQA Diamond89.1%Not measuredOnly Kimi K2.6 measured
MMMU Pro (Vals AI)86.3%63.0%Kimi K2.6
GPQA Diamond (Artificial Analysis run)91.1%58.8%Kimi K2.6
Humanity's Last Exam (Artificial Analysis run)37.5%4.7%Kimi K2.6
GPQA Diamond (Epoch AI run)90.8%Not measuredOnly Kimi K2.6 measured
Chess puzzles20.0%Not measuredOnly Kimi K2.6 measured
Mystery game puzzles18.0%Not measuredOnly Kimi K2.6 measured
EBR-bench2.4%Not measuredOnly Kimi K2.6 measured
LMArena Text: hard prompts14701426Kimi K2.6
LMArena Text: expert14911408Kimi K2.6
LMArena Text: hard prompts in English14711435Kimi K2.6
LMArena Vision: diagrams12981175Kimi K2.6
LMArena Vision: homework13101165Kimi K2.6
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral 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 AIME96.1%Not measuredOnly Kimi K2.6 measured
FrontierMath, tiers 1 to 357.2%Not measuredOnly Kimi K2.6 measured
FrontierMath, tier 425.6%Not measuredOnly Kimi K2.6 measured
ProofBench16.0%Not measuredOnly Kimi K2.6 measured
LMArena Text: math14741408Kimi K2.6
LMArena Text: mathematical work14801412Kimi K2.6
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 K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
MMLU Pro87.6%75.3%Kimi K2.6
LegalBench (Vals AI)84.7%62.0%Kimi K2.6
CaseLaw (Vals AI)61.2%Not measuredOnly Kimi K2.6 measured
CorpFin (Vals AI)66.7%50.7%Kimi K2.6
TaxEval (Vals AI)74.7%70.3%Kimi K2.6
MortgageTax (Vals AI)65.8%36.5%Kimi K2.6
MedQA (Vals AI)Not measured78.2%Only Mistral Medium 3.1 measured
MedCode (Vals AI)40.1%Not measuredOnly Kimi K2.6 measured
MMLU Pro (Artificial Analysis run)Not measured68.3%Only Mistral Medium 3.1 measured
SimpleQA Verified34.9%Not measuredOnly Kimi K2.6 measured
LMArena Text: science14681444Kimi K2.6
LMArena Text: medicine and healthcare14571449Kimi K2.6
LMArena Text: legal and government14621439Kimi K2.6
LMArena Text: business and finance14451418Kimi K2.6
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
Design Arena: websites12691133Kimi K2.6
Design Arena: UI components12661100Kimi K2.6
Design Arena: game dev12511074Kimi K2.6
Design Arena: data viz12491144Kimi K2.6
Design Arena: 3D12681081Kimi K2.6
Design Arena: all code categories12721120Kimi K2.6
Design Arena: SVG1181993Kimi K2.6
Design Arena: ASCII art1165997Kimi K2.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index270
General benchmarks for Kimi K2.6 and Mistral Medium 3.1
BenchmarkKimi K2.6Mistral Medium 3.1Leader
Public Benefits Bench (Vals AI)56.6%Not measuredOnly Kimi K2.6 measured
SAGE (Vals AI)50.2%Not measuredOnly Kimi K2.6 measured
MedScribe (Vals AI)78.2%Not measuredOnly Kimi K2.6 measured
Vals Multimodal Index56.4%Not measuredOnly Kimi K2.6 measured
IFBench76.0%39.8%Kimi K2.6
Long context reasoning (AA-LCR)81.0%42.7%Kimi K2.6
DTBench90.9%67.5%Kimi K2.6
LMCA37.3%19.1%Kimi K2.6
Furniture assembly21.7%Not measuredOnly Kimi K2.6 measured
ExploitBench18.4%Not measuredOnly Kimi K2.6 measured
LMArena Text14551424Kimi K2.6
LMArena Text: instruction following14511398Kimi K2.6
LMArena Text: creative writing14341391Kimi K2.6
LMArena Vision12821172Kimi K2.6
LMArena Text: English14601438Kimi K2.6
LMArena Text: non-English14461408Kimi K2.6
LMArena Text: Chinese15201447Kimi K2.6
LMArena Text: German14511432Kimi K2.6
LMArena Text: Japanese14431379Kimi K2.6
LMArena Text: Korean14271380Kimi K2.6
LMArena Text: French14711460Kimi K2.6
LMArena Text: Spanish14641433Kimi K2.6
LMArena Text: Russian14461411Kimi K2.6
LMArena Text: Polish14381430Kimi K2.6
LMArena Text: multi-turn14531418Kimi K2.6
LMArena Text: longer queries14681406Kimi K2.6
LMArena Text: writing and language14391395Kimi K2.6
LMArena Text: entertainment and media14281390Kimi K2.6
LMArena Vision: English12871179Kimi K2.6
LMArena Vision: Chinese13461190Kimi K2.6
LMArena Vision: reading text12911175Kimi K2.6
LMArena Vision: humor12801168Kimi K2.6
LMArena Vision: captioningNot measured1145Only Mistral Medium 3.1 measured
LMArena Vision: recognizing thingsNot measured1147Only Mistral Medium 3.1 measured
LMArena Vision: creative writing12731200Kimi K2.6
LMArena Document1451Not measuredOnly Kimi K2.6 measured
Neither model has a result on the other 10 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 Mistral Medium 3.1
BenchmarkKimi K2.6Mistral 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 K2.6$0.0029Fits 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 K2.6$0.059Fits 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 K2.6$0.230Fits 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 K2.6 and Mistral Medium 3.1
SpecificationMoonshotAI Kimi K2.6Mistral Medium 3.1
MakerMoonshot AIMistral AI
WeightsOpen weightsNo public weights listed
ReleasedApril 20, 2026August 13, 2025
Context window262K131K
Input $/Mtok$0.95$0.40
Output $/Mtok$4.00$2.00
Coding index52.1Not benchmarked
Independent measurements behind it30
Cost per solved task$0.35Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K2.6 better than Mistral Medium 3.1 for coding?

Only Kimi K2.6 has a coding score, 52.1 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 2.0x cheaper ($2.00 vs $4.00 per million).

Which is cheaper, Kimi K2.6 or Mistral Medium 3.1?

Kimi K2.6 costs $0.95 per million input tokens and $4.00 per million output tokens; Mistral Medium 3.1 costs $0.40 and $2.00. Cost per solved task is known for Kimi K2.6 only.

Which has the bigger context window, Kimi K2.6 or Mistral Medium 3.1?

Kimi K2.6, with 262K tokens against 131K.

How many benchmarks is the Kimi K2.6 vs Mistral Medium 3.1 comparison based on?

64 benchmarks have a result for both models as of October 21, 2026. Kimi K2.6's coding index rests on 3 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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