# Devstral 2 vs GPT-5.5 Pro

> GPT-5.5 Pro has enough public results to be ranked (#7); Devstral 2 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/devstral-2-vs-gpt-5-5-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- Devstral 2 is cheaper at $0.40 / $2 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
- Devstral 2 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral 2 | GPT-5.5 Pro |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 35.8 | 64.3 |
| Rank | — | 7 |
| Context | 262K | 1.05M |
| Input $/M | $0.40 | $30 |
| Output $/M | $2 | $180 |
| Weights | Open | Proprietary |

## Coding

- Devstral 2: 33.0 (#253)
- GPT-5.5 Pro: —

| Benchmark | Devstral 2 | GPT-5.5 Pro |
|---|---|---|
| SWE-bench Verified (bash only) | 53.8% | — |
| LMArena WebDev | 1196 | — |

## Reasoning

- Devstral 2: —
- GPT-5.5 Pro: 73.6 (#7)

| Benchmark | Devstral 2 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.45 |

## Math

- Devstral 2: —
- GPT-5.5 Pro: 83.8 (#8)

| Benchmark | Devstral 2 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |

## Knowledge

- Devstral 2: —
- GPT-5.5 Pro: 64.2 (#17)

| Benchmark | Devstral 2 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |

## FAQ

### Is Devstral 2 better than GPT-5.5 Pro?

GPT-5.5 Pro has enough public results to be ranked (#7); Devstral 2 does not yet, so treat this comparison as directional.

### Which is cheaper, Devstral 2 or GPT-5.5 Pro?

Devstral 2 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 262K.

### How many benchmarks do Devstral 2 and GPT-5.5 Pro share?

0 benchmarks have published results for both models. Devstral 2 has 2 scored results on Noometry and GPT-5.5 Pro has 14.