# Claude 3.5 Sonnet vs Devstral Small 2505

> Claude 3.5 Sonnet and Devstral Small 2505 score almost the same on the Noometry Index (34.6 vs 34.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-3-5-sonnet-vs-devstral-small
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Claude 3.5 Sonnet leads 23.1 to 19.7.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 34.6 | 34.3 |
| Rank | 231 | 233 |
| Context | — | 128K |
| Input $/M | — | $0.10 |
| Output $/M | — | $0.30 |
| Weights | Proprietary | Open |

## Coding

- Claude 3.5 Sonnet: 39.0 (#165)
- Devstral Small 2505: 38.9 (#166)

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| SWE-bench Verified (bash only) | — | 56.4% |
| Aider Polyglot | 51.6% | — |
| SciCode | — | 28.8% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| LMArena Coding | 1342 | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |

## Agentic & Tool Use

- Claude 3.5 Sonnet: 32.3 (#67)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |

## Reasoning

- Claude 3.5 Sonnet: 23.1 (#183)
- Devstral Small 2505: 19.7 (#252)

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| SimpleBench | 41.4% | — |
| Kagi LLM Benchmark | — | 37.7% |
| CritPt | — | 0% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| LMArena Hard Prompts | 1305 | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |

## Math

- Claude 3.5 Sonnet: 19.2 (#288)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | — |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| LMArena Math | 1307 | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Claude 3.5 Sonnet: 28.6 (#245)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| GPQA Diamond | 55.3% | — |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| LMArena Expert | 1265 | — |
| MMLU | 87.3% | — |

## Multimodal

- Claude 3.5 Sonnet: 26.5 (#120)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |

## Multilingual

- Claude 3.5 Sonnet: 43.2 (#185)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| LMArena Non-English | 1283 | — |
| LMArena Chinese | 1272 | — |
| LMArena French | 1305 | — |
| LMArena German | 1297 | — |
| LMArena Japanese | 1234 | — |
| LMArena Korean | 1200 | — |
| LMArena Russian | 1306 | — |
| LMArena Spanish | 1290 | — |

## Instruction Following

- Claude 3.5 Sonnet: 68.8 (#182)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
| LMArena Instruction Following | 1297 | — |

## Long Context

- Claude 3.5 Sonnet: 39.9 (#167)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| LMArena Longer Query | 1311 | — |

## Writing & Preference

- Claude 3.5 Sonnet: 52.9 (#164)
- Devstral Small 2505: —

| Benchmark | Claude 3.5 Sonnet | Devstral Small 2505 |
|---|---|---|
| LMArena Text | 1298 | — |
| LMArena Creative Writing | 1292 | — |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1326 | — |
| LiveBench Language | 53.8% | — |

## FAQ

### Is Claude 3.5 Sonnet better than Devstral Small 2505?

Claude 3.5 Sonnet and Devstral Small 2505 score almost the same on the Noometry Index (34.6 vs 34.3), so choose on price, context window or the category you care about most.

### Is Claude 3.5 Sonnet or Devstral Small 2505 better for coding?

They score almost the same on coding (39.0 vs 38.9); test both on your own repository before choosing.

### How many benchmarks do Claude 3.5 Sonnet and Devstral Small 2505 share?

0 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Devstral Small 2505 has 4.