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 GPT-5.5OpenAI |  DeepSeek-R1DeepSeek |  Mistral Large 2Mistral | DeepSeek-V3.1 DeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | Mistral | DeepSeek |
| Family | GPT | DeepSeek | Mistral | DeepSeek |
| Release date | 2026-04-23 | 2025-01-20 | 2024-07-24 | 2025-08-21 |
| Context window | 400,000 tokens | 128,000 tokens | 128,000 tokens | 128,000 tokens |
| Parameters | — | 671B | 123B | 671B |
| Modality | text, vision, audio | text | text | text |
| License | proprietary | MIT | Mistral Research License | MIT |
| Source | proprietary | open weights | open weights | open weights |
| 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. | Reasoning-focused open-weight model. | — | Large MoE open-weight model. Predecessor to DeepSeek-V4. |
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