# Devstral Small 2505 vs GPT-4.5

> GPT-4.5 is the stronger model overall, scoring 37.2 to 34.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/devstral-small-vs-gpt-4-5
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Devstral Small 2505 leads 19.7 to 13.9.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 34.3 | 37.2 |
| Rank | 233 | 208 |
| Context | 128K | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.30 | — |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.9 (#166)
- GPT-4.5: 42.2 (#109)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| Aider Polyglot | — | 44.9% |
| SciCode | 28.8% | — |
| WeirdML | — | 39.4% |
| LiveBench Coding | — | 75.2% |
| LMArena Coding | — | 1396 |

## Agentic & Tool Use

- Devstral Small 2505: —
- GPT-4.5: 27.9 (#97)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| Cybench | — | 17.5% |

## Reasoning

- Devstral Small 2505: 19.7 (#252)
- GPT-4.5: 13.9 (#330)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 34.5% |
| Kagi LLM Benchmark | 37.7% | — |
| ARC-AGI-1 | — | 10.3% |
| CritPt | 0% | — |
| EnigmaEval | — | 3.2% |
| LiveBench Reasoning | — | 71.1% |
| LMArena Hard Prompts | — | 1403 |
| LiveBench Data Analysis | — | 64.3% |
| Epoch Capabilities Index | — | 136.74 |
| ForecastBench | — | 61.7 |
| LiveBench | — | 69% |

## Math

- Devstral Small 2505: —
- GPT-4.5: 32.6 (#211)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 37.8% |
| LiveBench Math | — | 69.3% |
| LMArena Math | — | 1412 |
| MATH Level 5 | — | 78.6% |

## Knowledge

- Devstral Small 2505: —
- GPT-4.5: 32.5 (#211)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| GPQA Diamond | — | 68.7% |
| Humanity's Last Exam | — | 5.4% |
| Confabulations | — | 13.6% |
| LMArena Expert | — | 1394 |

## Multimodal

- Devstral Small 2505: —
- GPT-4.5: 37.6 (#71)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| LMArena Vision | — | 1195 |
| VPCT | — | 45% |

## Multilingual

- Devstral Small 2505: —
- GPT-4.5: 52.5 (#83)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| LMArena Non-English | — | 1413 |
| LMArena Chinese | — | 1421 |
| LMArena French | — | 1418 |
| LMArena German | — | 1457 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1392 |
| LMArena Russian | — | 1419 |

## Instruction Following

- Devstral Small 2505: —
- GPT-4.5: 72.6 (#134)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| LiveBench Instruction Following | — | 72.3% |
| LMArena Instruction Following | — | 1404 |

## Long Context

- Devstral Small 2505: —
- GPT-4.5: 40.4 (#155)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| Fiction.LiveBench | — | 63.9% |
| LMArena Longer Query | — | 1406 |

## Writing & Preference

- Devstral Small 2505: —
- GPT-4.5: 56.9 (#134)

| Benchmark | Devstral Small 2505 | GPT-4.5 |
|---|---|---|
| LMArena Text | — | 1417 |
| LMArena Creative Writing | — | 1394 |
| Short-Story Creative Writing | — | 75.6% |
| EQ-Bench Creative Writing | — | 1258 |
| LMArena Multi-Turn | — | 1444 |
| LiveBench Language | — | 61.5% |

## FAQ

### Is Devstral Small 2505 better than GPT-4.5?

GPT-4.5 is the stronger model overall, scoring 37.2 to 34.3 on the Noometry Index.

### Is Devstral Small 2505 or GPT-4.5 better for coding?

GPT-4.5 scores higher on coding benchmarks: 42.2 versus 38.9 in the Noometry coding category.

### How many benchmarks do Devstral Small 2505 and GPT-4.5 share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and GPT-4.5 has 42.