# GPT-5.5 Pro vs Magistral Small

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.9 on the Noometry Index. Magistral Small costs 90× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-magistral-small
- Last updated: 2026-10-10
- Shared benchmarks: 8

## Summary

- They share 8 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Magistral Small in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 6.9.
- The biggest single-benchmark swing is ARC-AGI-1: 96.5% for GPT-5.5 Pro and 5% for Magistral Small.
- Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 128K.
- Magistral Small has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 64.3 | 29.9 |
| Rank | 7 | 289 |
| Context | 1.05M | 128K |
| Input $/M | $30 | $0.50 |
| Output $/M | $180 | $1.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Pro: —
- Magistral Small: 37.8 (#172)

| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| SciCode | — | 35.2% |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Magistral Small: 6.9 (#345)

| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| ARC-AGI-2 | 84.6% | 0% |
| ARC-AGI-1 | 96.5% | 5% |
| CritPt | 30.6% | 0.3% |
| Chess Puzzles | 64% | 3% |
| DTBench | 96% | 61.3% |
| Epoch Capabilities Index | 162.45 | 133.19 |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 6.3% |
| LMCA | 53.9% | — |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Magistral Small: 24.9 (#253)

| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 30% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Magistral Small: 30.9 (#215)

| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| GPQA Diamond | 93.9% | 56.1% |

## FAQ

### Is GPT-5.5 Pro better than Magistral Small?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.9 on the Noometry Index. Magistral Small costs 90× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro or Magistral Small?

Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 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 128K.

### How many benchmarks do GPT-5.5 Pro and Magistral Small share?

8 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Magistral Small has 10.