Model comparison
GPT-5.5 Instant vs Mistral
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.9 on the Noometry Index.
Last verified . 17 shared benchmarks.
Mistral AISummary
- They share 17 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Mistral in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 16.6.
Side by side
| GPT-5.5 Instant | Mistral | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 42.7 | 29.9 |
| Released | 2026-05-05 | — |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 22 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 44.3 (#74), Mistral: 33.8 (#250)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Coding | 1433 | 1162 |
| SciCode | 48.6% | — |
Reasoning GPT-5.5 Instant leads
GPT-5.5 Instant: 24.9 (#155), Mistral: 22.2 (#200)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1149 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math GPT-5.5 Instant leads
GPT-5.5 Instant: 26.5 (#259), Mistral: 22.3 (#278)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Math | 1420 | 1180 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| Omni-MATH | — | 7.2% |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#74), Mistral: 16.6 (#288)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Expert | 1409 | 1125 |
| GPQA Diamond | 82.5% | — |
| MMLU-Pro | — | 27.7% |
| GPQA (HELM) | — | 30.3% |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Mistral: —
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 52.8 (#80), Mistral: 32.8 (#254)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Non-English | 1417 | 1129 |
| LMArena Chinese | 1456 | 1109 |
| LMArena French | 1428 | 1180 |
| LMArena German | 1411 | 1155 |
| LMArena Japanese | 1408 | 1013 |
| LMArena Korean | 1392 | 1032 |
| LMArena Russian | 1431 | 1168 |
| LMArena Spanish | 1429 | 1143 |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Mistral: 52.6 (#288)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Instruction Following | 1406 | 1152 |
| IFEval | — | 56.8% |
Long Context GPT-5.5 Instant leads
GPT-5.5 Instant: 43.4 (#96), Mistral: 35.0 (#245)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Longer Query | 1422 | 1153 |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Mistral: 37.0 (#260)
| Benchmark | GPT-5.5 Instant | Mistral |
|---|---|---|
| LMArena Text | 1419 | 1165 |
| LMArena Creative Writing | 1419 | 1158 |
| LMArena Multi-Turn | 1433 | 1147 |
| WildBench | — | 66% |
Frequently asked questions
Is GPT-5.5 Instant better than Mistral?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.9 on the Noometry Index.
Is GPT-5.5 Instant or Mistral better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 33.8 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and Mistral share?
17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Mistral has 22.