Model comparison
GPT-5.5 Pro vs Mistral Medium 3.1
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 84× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 10.6.
- Mistral Medium 3.1 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 131K.
Side by side
| GPT-5.5 Pro | Mistral Medium 3.1 | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 64.3 | 31.9 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 131K |
| Max output | 128K | 105K |
| Input $ / M tokens | $30 | $0.40 |
| Output $ / M tokens | $180 | $2 |
| Results tracked | 14 | 3 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Mistral Medium 3.1: 10.6 (#341)
| Benchmark | GPT-5.5 Pro | Mistral Medium 3.1 |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| NYT Connections (extended) | — | 6.5% |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| Thematic Generalization | — | 20.3% |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math Not comparable
GPT-5.5 Pro: 84.0 (#10), Mistral Medium 3.1: —
| Benchmark | GPT-5.5 Pro | Mistral Medium 3.1 |
|---|---|---|
| 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 Not comparable
GPT-5.5 Pro: 64.1 (#19), Mistral Medium 3.1: —
| Benchmark | GPT-5.5 Pro | Mistral Medium 3.1 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Mistral Medium 3.1: 55.5 (#145)
| Benchmark | GPT-5.5 Pro | Mistral Medium 3.1 |
|---|---|---|
| EQ-Bench Creative Writing | — | 1476 |
Frequently asked questions
Is GPT-5.5 Pro better than Mistral Medium 3.1?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 84× 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 Mistral Medium 3.1?
Mistral Medium 3.1 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 131K.
How many benchmarks do GPT-5.5 Pro and Mistral Medium 3.1 share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Mistral Medium 3.1 has 3.