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Head-to-head comparison

Kimi K3 vs. Mistral Medium 3.5

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series
48
distinct benchmarks
21
latest retrieval
2026-09-29

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Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for Kimi K3 and Mistral Medium 3.5
AttributeKimi K3Mistral Medium 3.5
ProviderMoonshot AIMistral AI
ReleasedJul 16, 2026Apr 28, 2026
AvailabilityActiveActive
Model typeOpen WeightsOpen Weights
Parameters2.8T, 104B active128B
ArchitectureMixture of ExpertsDense
Context window1,048,576 tokens262,144 tokens
Knowledge cutoffNot publishedNot published
Technical sourcesModelModel, Context

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for Kimi K3 and Mistral Medium 3.5
Price typeKimi K3Mistral Medium 3.5
API input$3$1.5
API output$15$7.5
Cache read$0.3Not listed
Cache write (5 min.)Not listedNot listed
Cache write (1 hr.)Not listedNot listed
Price verified09/22/2026 Source09/22/2026 Source
Kimi K3Mistral Medium 3.5
API inputUSD per 1M tokens, base tier
Kimi K3$3
Mistral Medium 3.5Lower price$1.5
API outputUSD per 1M tokens, base tier
Kimi K3$15
Mistral Medium 3.5Lower price$7.5

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for Kimi K3 and Mistral Medium 3.5
ModelProviderPurchase route and tariffInput per 1M tokensOutput per 1M tokensSource
Kimi K3Moonshot AIDirect from developerStandard API$3$15Source09/22/2026
AkashMLVia OpenRouterakashml/fp4$3$15Source10/02/2026
AlibabaVia OpenRouteralibaba$3.45$17.25Source10/02/2026
BaseTenVia OpenRouterbaseten/fp8$3$15Source10/02/2026
ChutesVia OpenRouterchutes/mxfp4$3$15Source10/02/2026
DecartVia OpenRouterdecart/mxfp4$3$15Source10/02/2026
DeepInfraVia OpenRouterdeepinfra/bf16$2.85$14.25Source10/02/2026
DigitalOceanVia OpenRouterdigitalocean$2.55$12.95Source10/02/2026
FireworksVia OpenRouterfireworks$3$15Source10/02/2026
FireworksVia OpenRouterfireworks/fast$4.5$22.5Source10/02/2026
FireworksVia OpenRouterfireworks/us$4.5$22.5Source10/02/2026
InferenceNetVia OpenRouterinference-net/fp4Lowest listed price: $1.34$13Source10/02/2026
MakoraVia OpenRoutermakora$2.04$12.75Source10/02/2026
ModalVia OpenRoutermodal/mxfp4$3$15Source10/02/2026
Moonshot AIVia OpenRoutermoonshotai/mxfp4$3$15Source10/02/2026
MorphVia OpenRoutermorph/fp8$1.35$11.357Source10/02/2026
ParasailVia OpenRouterparasail/fp4$3$15Source10/02/2026
PhalaVia OpenRouterphala$2.25$11.25Source10/02/2026
RelaceVia OpenRouterrelace/fp4$1.8Lowest listed price: $11.2Source10/02/2026
Sail ResearchVia OpenRoutersail-research/fp4$2.8$14Source10/02/2026
TogetherVia OpenRoutertogether$2.7$13.5Source10/02/2026
WaferVia OpenRouterwafer$1.4417$14Source10/02/2026
WaferVia OpenRouterwafer/us$2.8$14Source10/02/2026
Mistral Medium 3.5Mistral AIDirect from developerStandard APILowest listed price: $1.5Lowest listed price: $7.5Source09/22/2026
MistralVia OpenRoutermistralLowest listed price: $1.5Lowest listed price: $7.5Source10/02/2026
MistralVia OpenRoutermistral/eu$1.65$8.25Source10/02/2026
MistralVia OpenRoutermistral/zdrLowest listed price: $1.5Lowest listed price: $7.5Source10/02/2026

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

255075100CodingReasoningMathematicsKnowledgeFinanceLegalAgentic tasksHealth
Kimi K3
Mistral Medium 3.5
Coding: 100 / 35.4 (3 benchmark families)
Reasoning: 100 / 37.5 (1 benchmark family)
Mathematics: 100 / 10.3 (1 benchmark family)
Knowledge: 100 / 85.6 (1 benchmark family)
Finance: 100 / 55.2 (6 benchmark families)
Legal: 100 / 12.3 (2 benchmark families)
Agentic tasks: 100 / 48.1 (1 benchmark family)
Health: 100 / 73 (2 benchmark families)

20 matched rows from 20 benchmark families were considered. The radar shows 8 of 10 comparable categories.

Kimi K3Mistral Medium 3.5
Code MigrationOverall. Higher is better. No documented setup difference
Kimi K3Winner16.099 %
Mistral Medium 3.55.127 %
CorpFin v2Overall. Higher is better. No documented setup difference
Kimi K3Winner71.562 %
Mistral Medium 3.558.78 %
EMBOverall. Higher is better. No documented setup difference
Kimi K3Winner66.399 %
Mistral Medium 3.511.185 %
Finance Agent (v2)Overall. Higher is better. No documented setup difference
Kimi K3Winner54.36 %
Mistral Medium 3.532.103 %
GPQA DiamondOverall. Higher is better. No documented setup difference
Kimi K3Winner92.929 %
Mistral Medium 3.534.848 %
Harvey's Legal Agent BenchmarkOverall · Task fully resolved. Higher is better. No documented setup difference
Kimi K3Winner10.833 %
Mistral Medium 3.50.417 %
Legal Research BenchOverall · All-pass. Higher is better. No documented setup difference
Kimi K3Winner44.231 %
Mistral Medium 3.59.135 %
LMArena Text, Style ControlOverall. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,487.964
Mistral Medium 3.51,426.128
MedCodeOverall. Higher is better. No documented setup difference
Kimi K3Winner48.884 %
Mistral Medium 3.533.752 %
MedScribeOverall. Higher is better. No documented setup difference
Kimi K3Winner87.958 %
Mistral Medium 3.567.728 %
MMLU-ProOverall. Higher is better. No documented setup difference
Kimi K3Winner87.973 %
Mistral Medium 3.575.335 %
MortgageTaxOverall. Higher is better. No documented setup difference
Kimi K3Winner66.336 %
Mistral Medium 3.528.895 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for Kimi K3 and Mistral Medium 3.5
Benchmark and taskKimi K3Mistral Medium 3.5Source
Code MigrationOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner16.099 %
5.127 %
Vals AI
Source details
Data as of: 09/27/2026
CorpFin v2Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner71.562 %
58.78 %
Vals AI
Source details
Data as of: 08/12/2026
EMBOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner66.399 %
11.185 %
Vals AI
Source details
Data as of: 09/27/2026
Finance Agent (v2)Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner54.36 %
32.103 %
Vals AI
Source details
Data as of: 09/27/2026
GPQA DiamondOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner92.929 %
34.848 %
Vals AI
Source details
Data as of: 09/01/2026
Harvey's Legal Agent BenchmarkOverall · Task fully resolved
Test details
No documented difference in the test setupVersion: 1Metric: task resolution rateScoring: Higher is better
Winner10.833 %
0.417 %
Vals AI
Source details
Data as of: 09/27/2026
Legal Research BenchOverall · All-pass
Test details
No documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is better
Winner44.231 %
9.135 %
Vals AI
Source details
Data as of: 09/27/2026
LMArena Text, Style ControlOverall
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 26,400 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 11,693 anonymous pairwise votes.
Higher measured value1,487.964
95% confidence interval: ±4.866The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,426.128
95% confidence interval: ±6.42The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
MedCodeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner48.884 %
33.752 %
Vals AI
Source details
Data as of: 09/26/2026
MedScribeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner87.958 %
67.728 %
Vals AI
Source details
Data as of: 09/26/2026
MMLU-ProOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner87.973 %
75.335 %
Vals AI
Source details
Data as of: 09/01/2026
MortgageTaxOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner66.336 %
28.895 %
Vals AI
Source details
Data as of: 09/01/2026
ProofBenchOverall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is better
Winner87 %
9 %
Vals AI
Source details
Data as of: 09/28/2026
SAGEOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner54.26 %
37.613 %
Vals AI
Source details
Data as of: 09/26/2026
SWE-bench VerifiedOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner93.4 %
66.4 %
Vals AI
Source details
Data as of: 09/01/2026
Tax Agent BenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner68.672 %
27.291 %
Vals AI
Source details
Data as of: 09/27/2026
TaxEval v2Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner75.716 %
67.988 %
Vals AI
Source details
Data as of: 09/01/2026
Terminal-Bench 2.1Overall
Test details
No documented difference in the test setupVersion: 2.1Metric: accuracyScoring: Higher is better
Winner80.899 %
38.951 %
Vals AI
Source details
Data as of: 09/27/2026
Vals IndexOverall
Test details
No documented difference in the test setupVersion: 2Metric: weighted index scoreScoring: Higher is better
Winner57.813 %
17.947 %
Vals AI
Source details
Data as of: 09/27/2026
Vals Multimodal IndexOverall
Test details
No documented difference in the test setupVersion: 1.2Metric: weighted index scoreScoring: Higher is better
Winner73.42 %
34.768 %
Vals AI
Source details
Data as of: 08/11/2026
Vibe Code Bench v1.1Overall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands
Winner84.963 %
2.888 %
Vals AI
Source details
Data as of: 09/27/2026
LMArena Text, Style ControlBusiness, management and finance
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 5,149 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,256 anonymous pairwise votes.
Higher measured value1,489.173
95% confidence interval: ±8.766The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,430.173
95% confidence interval: ±12.827The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlChinese
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 1,940 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 621 anonymous pairwise votes.
Higher measured value1,539.78
95% confidence interval: ±13.819The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,446.524
95% confidence interval: ±23.931The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlCoding
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 6,878 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,282 anonymous pairwise votes.
Higher measured value1,540.544
95% confidence interval: ±7.811The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,477.898
95% confidence interval: ±10.854The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlCreative writing
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 5,249 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,999 anonymous pairwise votes.
Higher measured value1,458.257
95% confidence interval: ±9.02The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,397.828
95% confidence interval: ±13.94The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlEnglish
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 10,028 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 5,562 anonymous pairwise votes.
Higher measured value1,493.173
95% confidence interval: ±6.62The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,442.84
95% confidence interval: ±8.53The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlEntertainment, sports and media
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 6,417 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,618 anonymous pairwise votes.
Higher measured value1,459.187
95% confidence interval: ±8.256The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,394.24
95% confidence interval: ±12.151The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlExcluding ties
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 19,504 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 8,856 anonymous pairwise votes.
Higher measured value1,501.41
95% confidence interval: ±6.35The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,419.562
95% confidence interval: ±8.482The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlExpert prompts
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 2,457 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,205 anonymous pairwise votes.
Higher measured value1,532.809
95% confidence interval: ±12.276The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,433.7
95% confidence interval: ±17.235The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlFrench
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 944 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 453 anonymous pairwise votes.
Higher measured value1,506.507
95% confidence interval: ±20.255The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,435.855
95% confidence interval: ±29.943The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlGerman
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 508 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 173 anonymous pairwise votes.
Higher measured value1,487.756
95% confidence interval: ±26.837The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,447.96
95% confidence interval: ±43.885The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlHard prompts
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 17,130 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 7,627 anonymous pairwise votes.
Higher measured value1,516.598
95% confidence interval: ±5.615The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,444.677
95% confidence interval: ±7.686The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlHard prompts, English
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 6,516 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,821 anonymous pairwise votes.
Higher measured value1,514.741
95% confidence interval: ±7.894The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,455.806
95% confidence interval: ±10.148The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlInstruction following
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 8,851 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,827 anonymous pairwise votes.
Higher measured value1,486.2
95% confidence interval: ±7.06The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,420.763
95% confidence interval: ±10.011The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlKorean
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 567 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 188 anonymous pairwise votes.
Higher measured value1,476.936
95% confidence interval: ±24.854The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,392.677
95% confidence interval: ±43.291The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlLegal and government
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 2,120 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 893 anonymous pairwise votes.
Higher measured value1,513.54
95% confidence interval: ±13.409The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,437.755
95% confidence interval: ±20.721The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlLife, physical and social science
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 4,134 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,939 anonymous pairwise votes.
Higher measured value1,521.44
95% confidence interval: ±9.547The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,435.825
95% confidence interval: ±13.971The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlLonger queries
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 11,778 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 5,065 anonymous pairwise votes.
Higher measured value1,503.731
95% confidence interval: ±6.651The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,428.117
95% confidence interval: ±9.119The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlMath
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 1,131 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 565 anonymous pairwise votes.
Higher measured value1,499.153
95% confidence interval: ±17.579The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,428.606
95% confidence interval: ±24.143The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlMathematical professions
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 1,381 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 653 anonymous pairwise votes.
Higher measured value1,512.282
95% confidence interval: ±16.286The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,438.481
95% confidence interval: ±22.896The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlMedicine and healthcare
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 1,822 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 844 anonymous pairwise votes.
Higher measured value1,510.85
95% confidence interval: ±14.327The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,421.161
95% confidence interval: ±21.257The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlMulti-turn
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 4,075 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,925 anonymous pairwise votes.
Higher measured value1,500.724
95% confidence interval: ±9.804The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,432.256
95% confidence interval: ±14.007The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlNon-English
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 16,361 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 6,131 anonymous pairwise votes.
Higher measured value1,477.001
95% confidence interval: ±5.678The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,406.139
95% confidence interval: ±8.159The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlPolish
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 428 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 235 anonymous pairwise votes.
Higher measured value1,489.166
95% confidence interval: ±27.535The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,415.979
95% confidence interval: ±38.135The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlRussian
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 3,175 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,242 anonymous pairwise votes.
Higher measured value1,493.777
95% confidence interval: ±10.901The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,410.34
95% confidence interval: ±17.157The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlSoftware and IT services
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 10,253 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 4,587 anonymous pairwise votes.
Higher measured value1,526.074
95% confidence interval: ±6.653The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,468.806
95% confidence interval: ±9.304The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlSpanish
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 810 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 393 anonymous pairwise votes.
Higher measured value1,484.797
95% confidence interval: ±20.864The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,392.394
95% confidence interval: ±31.573The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026
LMArena Text, Style ControlWriting, literature and language
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterKimi K3: Snapshot: kimi-k3-max, Reasoning: max, Harness: Arena text, style control
Mistral Medium 3.5: Snapshot: mistral-medium-3.5, Harness: Arena text, style control
Kimi K3: Style-controlled Arena rating from 6,938 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,919 anonymous pairwise votes.
Higher measured value1,474.679
95% confidence interval: ±7.931The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,403.766
95% confidence interval: ±11.409The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
LMArena
Source details
Data as of: 09/25/2026

Key to the marks:better valuebetter, but not conclusivetie

Our model tests

Our tests

Compare how the models respond to the same prompt. Each test shows the first attempt, with no subsequent fixes to the generated code. These results do not contribute to an overall score.

Pelican on a bicycle

A community classic for free-form SVG drawing.

Kimi K3

API access was unavailable for this run. The model was not evaluated.

Reasoning (requested): high

First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
moonshotai/kimi-k3
Reasoning setting
high
Pinned endpoint
Moonshot AI | moonshotai/kimi-k3-20260715
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Not run

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Mistral Medium 3.5

API access was unavailable for this run. The model was not evaluated.

Reasoning (requested): high

First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
mistralai/mistral-medium-3-5
Reasoning setting
high
Pinned endpoint
Mistral | mistralai/mistral-medium-3.5-20260430
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Not run

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Compare Kimi K3 and Mistral Medium 3.5 with other leading models using the same data and benchmark logic.

View the complete LLM comparison