# Claude 3.5 Sonnet vs Mistral Small 3.1

> Claude 3.5 Sonnet is the stronger model overall, scoring 34.6 to 31.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-5-sonnet-vs-mistral-small-3-1
- Last updated: 2026-10-12
- Shared benchmarks: 27

## Summary

- They share 27 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 8 categories and Mistral Small 3.1 in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Claude 3.5 Sonnet leads 52.9 to 37.0.
- The biggest single-benchmark swing is GPQA (HELM): 56.5% for Claude 3.5 Sonnet and 39.2% for Mistral Small 3.1.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 34.6 | 31.7 |
| Rank | 231 | 269 |
| Context | — | 128K |
| Input $/M | — | $0.35 |
| Output $/M | — | $0.56 |
| Weights | Proprietary | Open |

## Coding

- Claude 3.5 Sonnet: 39.0 (#165)
- Mistral Small 3.1: 38.3 (#179)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1342 | 1309 |
| Aider Polyglot | 51.6% | — |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |

## Agentic & Tool Use

- Claude 3.5 Sonnet: 32.3 (#67)
- Mistral Small 3.1: —

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |

## Reasoning

- Claude 3.5 Sonnet: 23.1 (#183)
- Mistral Small 3.1: 19.7 (#254)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Hard Prompts | 1305 | 1278 |
| Epoch Capabilities Index | 133.55 | 127.48 |
| SimpleBench | 41.4% | — |
| Chess Puzzles | — | 1% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |

## Math

- Claude 3.5 Sonnet: 19.2 (#288)
- Mistral Small 3.1: 14.7 (#301)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 3.9% |
| Omni-MATH | 27.6% | 24.8% |
| LMArena Math | 1307 | 1262 |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Claude 3.5 Sonnet: 28.6 (#245)
- Mistral Small 3.1: 22.6 (#271)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 55.3% | 41.9% |
| MMLU-Pro | 77.7% | 61% |
| GPQA (HELM) | 56.5% | 39.2% |
| LMArena Expert | 1265 | 1257 |
| Humanity's Last Exam | 4.1% | — |
| Confabulations | 19.9% | — |
| MMLU | 87.3% | — |

## Multimodal

- Claude 3.5 Sonnet: 26.5 (#120)
- Mistral Small 3.1: 33.2 (#99)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | 1125 | 1136 |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |

## Multilingual

- Claude 3.5 Sonnet: 43.2 (#185)
- Mistral Small 3.1: 41.2 (#209)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1283 | 1255 |
| LMArena Chinese | 1272 | 1253 |
| LMArena French | 1305 | 1273 |
| LMArena German | 1297 | 1266 |
| LMArena Japanese | 1234 | 1208 |
| LMArena Korean | 1200 | 1206 |
| LMArena Russian | 1306 | 1263 |
| LMArena Spanish | 1290 | 1283 |

## Instruction Following

- Claude 3.5 Sonnet: 68.8 (#182)
- Mistral Small 3.1: 63.6 (#230)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| IFEval | 85.5% | 75% |
| LMArena Instruction Following | 1297 | 1264 |
| LiveBench Instruction Following | 69.3% | — |

## Long Context

- Claude 3.5 Sonnet: 39.9 (#167)
- Mistral Small 3.1: 39.5 (#178)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1311 | 1299 |

## Writing & Preference

- Claude 3.5 Sonnet: 52.9 (#164)
- Mistral Small 3.1: 37.0 (#259)

| Benchmark | Claude 3.5 Sonnet | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1298 | 1277 |
| LMArena Creative Writing | 1292 | 1253 |
| EQ-Bench Creative Writing | 1451 | 761 |
| WildBench | 79.2% | 78.8% |
| LMArena Multi-Turn | 1326 | 1270 |
| Short-Story Creative Writing | 80.3% | — |
| LiveBench Language | 53.8% | — |

## FAQ

### Is Claude 3.5 Sonnet better than Mistral Small 3.1?

Claude 3.5 Sonnet is the stronger model overall, scoring 34.6 to 31.7 on the Noometry Index.

### Is Claude 3.5 Sonnet or Mistral Small 3.1 better for coding?

They score almost the same on coding (39.0 vs 38.3); test both on your own repository before choosing.

### How many benchmarks do Claude 3.5 Sonnet and Mistral Small 3.1 share?

27 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Mistral Small 3.1 has 28.