Model comparison
GPT-5.5 Pro vs Magistral Medium
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 35.2 on the Noometry Index. Magistral Medium costs 25× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
Mistral AISummary
- They share 3 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Magistral Medium 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 8.6.
- The biggest single-benchmark swing is ARC-AGI-1: 96.5% for GPT-5.5 Pro and 6.1% for Magistral Medium.
- Magistral Medium is cheaper at $2 / $5 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.
- Magistral Medium has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Magistral Medium | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 64.3 | 35.2 |
| Released | 2026-04-23 | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 16K |
| Input $ / M tokens | $30 | $2 |
| Output $ / M tokens | $180 | $5 |
| Results tracked | 14 | 22 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Magistral Medium: 39.1 (#161)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| SciCode | — | 39.2% |
| LMArena Coding | — | 1319 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Magistral Medium: 8.6 (#348)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| ARC-AGI-2 | 84.6% | 0% |
| ARC-AGI-1 | 96.5% | 6.1% |
| CritPt | 30.6% | 0.3% |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 16.2% |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1267 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Magistral Medium: 35.1 (#189)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1250 |
| 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 Medium: 33.5 (#202)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1223 |
Multilingual Not comparable
GPT-5.5 Pro: —, Magistral Medium: 39.6 (#224)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| LMArena Non-English | — | 1232 |
| LMArena Chinese | — | 1227 |
| LMArena French | — | 1267 |
| LMArena German | — | 1248 |
| LMArena Japanese | — | 1175 |
| LMArena Korean | — | 1125 |
| LMArena Russian | — | 1224 |
| LMArena Spanish | — | 1271 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Magistral Medium: 66.0 (#211)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| LMArena Instruction Following | — | 1254 |
Long Context Not comparable
GPT-5.5 Pro: —, Magistral Medium: 39.3 (#183)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| LMArena Longer Query | — | 1295 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Magistral Medium: 46.3 (#219)
| Benchmark | GPT-5.5 Pro | Magistral Medium |
|---|---|---|
| LMArena Text | — | 1255 |
| LMArena Creative Writing | — | 1245 |
| LMArena Multi-Turn | — | 1275 |
Frequently asked questions
Is GPT-5.5 Pro better than Magistral Medium?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 35.2 on the Noometry Index. Magistral Medium costs 25× 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 Medium?
Magistral Medium is cheaper. It lists at $2 per million input tokens and $5 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 GPT-5.5 Pro and Magistral Medium share?
3 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Magistral Medium has 22.