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 o3OpenAI |  Mistral Large 2Mistral |  DeepSeek-R1DeepSeek | GPT-5.5 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | Mistral | DeepSeek | OpenAI |
| Family | o-series | Mistral | DeepSeek | GPT |
| Release date | 2025-04-16 | 2024-07-24 | 2025-01-20 | 2026-04-23 |
| Context window | 200,000 tokens | 128,000 tokens | 128,000 tokens | 400,000 tokens |
| Parameters | — | 123B | 671B | — |
| Modality | text, vision | text | text | text, vision, audio |
| License | proprietary | Mistral Research License | MIT | proprietary |
| Source | proprietary | open weights | open weights | proprietary |
| Description | Reasoning-focused model in the o-series. | — | Reasoning-focused open-weight model. | 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. |
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