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 GPT-5.5OpenAI |  Mistral Large 2Mistral |  Gemini 3.5 | |
|---|---|---|---|
| Vendor | OpenAI | Mistral | |
| Family | GPT | Mistral | Gemini |
| Release date | 2026-04-23 | 2024-07-24 | 2026-05-20 |
| Context window | 400,000 tokens | 128,000 tokens | 2,000,000 tokens |
| Parameters | — | 123B | — |
| Modality | text, vision, audio | text | text, vision, audio, video |
| License | proprietary | Mistral Research License | proprietary |
| Source | proprietary | open weights | proprietary |
| Description | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | Large text-only Mistral model with a 128K context window and 123B parameters, tuned for strong instruction following and long-context reasoning. Mistral's flagship open-weights release in the Large 2 line. | Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | 87.6% | — | 88.9% |
| GPQA-D | 89.4% | — | 91.2% |
| HumanEval | 96.8% | 89.0% | — |
| Aider | 89.7% | — | — |
| AIME-25 | 94.2% | — | 96.1% |
| LiveCB | 78.9% | — | — |
| MMMU | 78.4% | — | 86.0% |
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