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
- 28
- distinct benchmarks
- 1
- latest retrieval
- 2026-09-04
Change model selection
Specifications
General specifications
Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.
| Attribute | Kimi K3 | Mistral Medium 3.5 |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Released | Jul 16, 2026 | Apr 28, 2026 |
| Availability | Active | Active |
| Model type | Open Weights | Open Weights |
| Parameters | 2.8T, 104B active | Not published |
| Architecture | Mixture of Experts | Not published |
| Context window | 1,048,576 tokens | 256,000 tokens |
| Knowledge cutoff | Not published | Not published |
| Technical sources | Model | Model |
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.
| Price type | Kimi K3 | Mistral Medium 3.5 |
|---|---|---|
| API input | $3 | $1.5 |
| API output | $15 | $7.5 |
| Cache read | $0.3 | Not listed |
| Cache write (5 min.) | Not listed | Not listed |
| Cache write (1 hr.) | Not listed | Not listed |
| Price verified | 07/30/2026 Source | 07/30/2026 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.
| Model | Provider | Purchase route and tariff | Input per 1M tokens | Output per 1M tokens | Source |
|---|---|---|---|---|---|
| Kimi K3 | Moonshot AI | Direct from developerStandard API | $3 | $15 | Source07/30/2026 |
| Alibaba | Via OpenRouteralibaba | $3.45 | $17.25 | Source09/06/2026 | |
| BaseTen | Via OpenRouterbaseten/fp8 | $3 | $15 | Source09/06/2026 | |
| Chutes | Via OpenRouterchutes/mxfp4 | $3 | $15 | Source09/06/2026 | |
| DeepInfra | Via OpenRouterdeepinfra/bf16 | $2.85 | $14.25 | Source09/06/2026 | |
| DigitalOcean | Via OpenRouterdigitalocean | $2.85 | $14.25 | Source09/06/2026 | |
| Fireworks | Via OpenRouterfireworks | $3 | $15 | Source09/06/2026 | |
| Fireworks | Via OpenRouterfireworks/fast | $4.5 | $22.5 | Source09/06/2026 | |
| Fireworks | Via OpenRouterfireworks/us | $3.3 | $16.5 | Source09/06/2026 | |
| Makora | Via OpenRoutermakora | Lowest listed price: $2.55 | Lowest listed price: $12.75 | Source09/06/2026 | |
| Modal | Via OpenRoutermodal/mxfp4 | $3 | $15 | Source09/06/2026 | |
| Moonshot AI | Via OpenRoutermoonshotai/mxfp4 | $3 | $15 | Source09/06/2026 | |
| Morph | Via OpenRoutermorph/fast | $6 | $22.5 | Source09/06/2026 | |
| Morph | Via OpenRoutermorph/fp4 | $2.6 | $14 | Source09/06/2026 | |
| Parasail | Via OpenRouterparasail/fp4 | $3 | $15 | Source09/06/2026 | |
| Phala | Via OpenRouterphala | $3 | $15 | Source09/06/2026 | |
| Sail Research | Via OpenRoutersail-research/fp4 | $2.6 | $13 | Source09/06/2026 | |
| Together | Via OpenRoutertogether | $3 | $15 | Source09/06/2026 | |
| Wafer | Via OpenRouterwafer | $3 | Lowest listed price: $12.75 | Source09/06/2026 | |
| Mistral Medium 3.5 | Mistral AI | Direct from developerStandard API | Lowest listed price: $1.5 | Lowest listed price: $7.5 | Source07/30/2026 |
| Mistral | Via OpenRoutermistral | Lowest listed price: $1.5 | Lowest listed price: $7.5 | Source09/06/2026 | |
| Mistral | Via OpenRoutermistral/eu | $1.65 | $8.25 | Source09/06/2026 | |
| Mistral | Via OpenRoutermistral/zdr | Lowest listed price: $1.5 | Lowest listed price: $7.5 | Source09/06/2026 |
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.
Not enough directly matched categories for a reliable radar
Only 0 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.
Kimi K3Mistral Medium 3.5
LMArena Text, Style ControlOverall. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,489.017
Mistral Medium 3.51,426.98
LMArena Text, Style ControlBusiness, management and finance. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,489.216
Mistral Medium 3.51,431.113
LMArena Text, Style ControlChinese. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,528.536
Mistral Medium 3.51,448.299
LMArena Text, Style ControlCoding. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,541.739
Mistral Medium 3.51,478.845
LMArena Text, Style ControlCreative writing. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,459.502
Mistral Medium 3.51,396.971
LMArena Text, Style ControlEnglish. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,496.027
Mistral Medium 3.51,444.656
LMArena Text, Style ControlEntertainment, sports and media. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,451.659
Mistral Medium 3.51,396.875
LMArena Text, Style ControlExcluding ties. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,502.224
Mistral Medium 3.51,421.17
LMArena Text, Style ControlExpert prompts. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,527.236
Mistral Medium 3.51,438.278
LMArena Text, Style ControlFrench. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,506.818
Mistral Medium 3.51,436.08
LMArena Text, Style ControlGerman. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,467.257
Mistral Medium 3.51,442.607
LMArena Text, Style ControlHard prompts. Higher is better. Test setup not documented as identical
Kimi K3Higher measured value1,519.227
Mistral Medium 3.51,445.592
Key to the marks:better valuebetter, but not conclusivetie
| Benchmark and task | Kimi K3 | Mistral Medium 3.5 | Source |
|---|---|---|---|
LMArena Text, Style ControlOverallTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 17,895 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 11,017 anonymous pairwise votes. | Higher measured value1,489.017 95% confidence interval: ±5.47The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,426.98 95% confidence interval: ±6.556The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlBusiness, management and financeTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 3,520 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,148 anonymous pairwise votes. | Higher measured value1,489.216 95% confidence interval: ±10.41The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,431.113 95% confidence interval: ±13.17The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlChineseTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 1,168 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 500 anonymous pairwise votes. | Higher measured value1,528.536 95% confidence interval: ±17.657The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,448.299 95% confidence interval: ±26.61The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCodingTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 4,669 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,079 anonymous pairwise votes. | Higher measured value1,541.739 95% confidence interval: ±9.193The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,478.845 95% confidence interval: ±11.157The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlCreative writingTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 3,543 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,862 anonymous pairwise votes. | Higher measured value1,459.502 95% confidence interval: ±10.685The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,396.971 95% confidence interval: ±14.389The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEnglishTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 6,981 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 5,299 anonymous pairwise votes. | Higher measured value1,496.027 95% confidence interval: ±7.574The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,444.656 95% confidence interval: ±8.682The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlEntertainment, sports and mediaTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 4,327 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,453 anonymous pairwise votes. | Higher measured value1,451.659 95% confidence interval: ±9.734The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,396.875 95% confidence interval: ±12.491The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExcluding tiesTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 13,279 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 8,299 anonymous pairwise votes. | Higher measured value1,502.224 95% confidence interval: ±7.169The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,421.17 95% confidence interval: ±8.686The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlExpert promptsTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 1,606 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,110 anonymous pairwise votes. | Higher measured value1,527.236 95% confidence interval: ±15.094The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,438.278 95% confidence interval: ±17.831The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlFrenchTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 676 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 438 anonymous pairwise votes. | Higher measured value1,506.818 95% confidence interval: ±23.704The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,436.08 95% confidence interval: ±30.551The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlGermanTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 363 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 170 anonymous pairwise votes. | Higher measured value1,467.257 95% confidence interval: ±31.268The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,442.607 95% confidence interval: ±44.317The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard promptsTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 11,628 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 7,154 anonymous pairwise votes. | Higher measured value1,519.227 95% confidence interval: ±6.437The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,445.592 95% confidence interval: ±7.857The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlHard prompts, EnglishTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 4,510 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,629 anonymous pairwise votes. | Higher measured value1,517.706 95% confidence interval: ±9.203The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,458.246 95% confidence interval: ±10.39The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlInstruction followingTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 5,969 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 3,561 anonymous pairwise votes. | Higher measured value1,487.97 95% confidence interval: ±8.244The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,422.491 95% confidence interval: ±10.335The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlKoreanTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 423 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 178 anonymous pairwise votes. | Higher measured value1,480.618 95% confidence interval: ±28.672The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,394.42 95% confidence interval: ±44.572The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLegal and governmentTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 1,419 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 839 anonymous pairwise votes. | Higher measured value1,509.331 95% confidence interval: ±16.311The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,437.785 95% confidence interval: ±21.302The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLife, physical and social scienceTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 2,821 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,823 anonymous pairwise votes. | Higher measured value1,518.8 95% confidence interval: ±11.431The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,433.494 95% confidence interval: ±14.359The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlLonger queriesTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 7,952 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 4,661 anonymous pairwise votes. | Higher measured value1,502.353 95% confidence interval: ±7.68The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,430.723 95% confidence interval: ±9.428The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 756 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 539 anonymous pairwise votes. | Higher measured value1,504.235 95% confidence interval: ±21.422The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,429.582 95% confidence interval: ±24.872The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMathematical professionsTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 892 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 597 anonymous pairwise votes. | Higher measured value1,513.757 95% confidence interval: ±19.948The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,442.192 95% confidence interval: ±23.932The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMedicine and healthcareTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 1,234 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 802 anonymous pairwise votes. | Higher measured value1,509.063 95% confidence interval: ±17.314The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,423.47 95% confidence interval: ±21.791The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlMulti-turnTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 2,862 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,803 anonymous pairwise votes. | Higher measured value1,499.114 95% confidence interval: ±11.625The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,431.302 95% confidence interval: ±14.433The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlNon-EnglishTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 10,909 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 5,718 anonymous pairwise votes. | Higher measured value1,476.872 95% confidence interval: ±6.548The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,406.687 95% confidence interval: ±8.36The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlPolishTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 290 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 226 anonymous pairwise votes. | Higher measured value1,504.812 95% confidence interval: ±32.715The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,407.955 95% confidence interval: ±38.858The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlRussianTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 1,949 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 1,143 anonymous pairwise votes. | Higher measured value1,490.113 95% confidence interval: ±13.716The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,415.692 95% confidence interval: ±17.832The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSoftware and IT servicesTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 7,013 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 4,320 anonymous pairwise votes. | Higher measured value1,528.32 95% confidence interval: ±7.648The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,470.76 95% confidence interval: ±9.541The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlSpanishTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 555 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 377 anonymous pairwise votes. | Higher measured value1,487.547 95% confidence interval: ±25.074The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,386.845 95% confidence interval: ±32.418The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
LMArena Text, Style ControlWriting, literature and languageTest detailsTest 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 controlKimi K3: Style-controlled Arena rating from 4,706 anonymous pairwise votes.Mistral Medium 3.5: Style-controlled Arena rating from 2,734 anonymous pairwise votes. | Higher measured value1,472.249 95% confidence interval: ±9.224The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | 1,405.944 95% confidence interval: ±11.74The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result. | LMArenaSource detailsData as of: 09/01/2026 |
Key to the marks:better valuebetter, but not conclusivetie | |||
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
Related LLM comparisons
Compare Kimi K3 and Mistral Medium 3.5 with other leading models using the same data and benchmark logic.