Model comparison
GPT-5.5 Pro vs Magistral Small
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 30.2 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.
Last verified . 8 shared benchmarks.
Mistral AISummary
- 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 73.3 to 6.8.
- 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.
Side by side
| GPT-5.5 Pro | Magistral Small | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 64.3 | 30.2 |
| Released | 2026-04-23 | 2025-06-10 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 128K |
| Max output | 128K | 40K |
| Input $ / M tokens | $30 | $0.50 |
| Output $ / M tokens | $180 | $1.50 |
| Results tracked | 14 | 10 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Magistral Small: 38.4 (#176)
| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| SciCode | — | 35.2% |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Magistral Small: 6.8 (#350)
| 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 | 162.07 | 133.19 |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 6.3% |
| LMCA | 53.9% | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Magistral Small: 26.2 (#261)
| 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 leads
GPT-5.5 Pro: 64.1 (#19), Magistral Small: 30.9 (#223)
| Benchmark | GPT-5.5 Pro | Magistral Small |
|---|---|---|
| GPQA Diamond | 93.9% | 56.1% |
Frequently asked questions
Is GPT-5.5 Pro better than Magistral Small?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 30.2 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.