Model comparison
GPT-5.5 Pro vs Mistral Large 3
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.1 on the Noometry Index. Mistral Large 3 costs 180× 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 15.2.
- Mistral Large 3 is cheaper at $0.25 / $0.75 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.
- Mistral Large 3 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Mistral Large 3 | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 64.3 | 39.1 |
| Released | 2026-04-23 | 2025-12-02 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 8K |
| Input $ / M tokens | $30 | $0.25 |
| Output $ / M tokens | $180 | $0.75 |
| Results tracked | 14 | 24 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 34.4 (#237)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena WebDev | — | 1230 |
| LMArena Coding | — | 1448 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Mistral Large 3: 15.2 (#319)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| Kagi LLM Benchmark | — | 50.9% |
| NYT Connections (extended) | — | 7.5% |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| Thematic Generalization | — | 23% |
| LMArena Hard Prompts | — | 1429 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Mistral Large 3: 38.7 (#129)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1414 |
| 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), Mistral Large 3: 36.0 (#177)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| Vectara Hallucination Rate | — | 14.5% |
| LMArena Expert | — | 1421 |
Multimodal Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 38.2 (#66)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena Vision | — | 1221 |
Multilingual Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 52.5 (#84)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena Non-English | — | 1413 |
| LMArena Chinese | — | 1447 |
| LMArena French | — | 1455 |
| LMArena German | — | 1437 |
| LMArena Japanese | — | 1394 |
| LMArena Korean | — | 1384 |
| LMArena Russian | — | 1411 |
| LMArena Spanish | — | 1440 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 74.0 (#108)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena Instruction Following | — | 1403 |
Long Context Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 43.1 (#105)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena Longer Query | — | 1413 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Mistral Large 3: 60.0 (#101)
| Benchmark | GPT-5.5 Pro | Mistral Large 3 |
|---|---|---|
| LMArena Text | — | 1428 |
| LMArena Creative Writing | — | 1386 |
| EQ-Bench Creative Writing | — | 1412 |
| LMArena Multi-Turn | — | 1429 |
Frequently asked questions
Is GPT-5.5 Pro better than Mistral Large 3?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 39.1 on the Noometry Index. Mistral Large 3 costs 180× 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 Large 3?
Mistral Large 3 is cheaper. It lists at $0.25 per million input tokens and $0.75 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 Mistral Large 3 share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Mistral Large 3 has 24.