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 o3OpenAI |  DeepSeek-V3.1DeepSeek | GPT-5.5 OpenAI |  Gemini 2.5 Pro | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | OpenAI | |
| Family | o-series | DeepSeek | GPT | Gemini |
| Release date | 2025-04-16 | 2025-08-21 | 2026-04-23 | 2025-03-25 |
| Context window | 200,000 tokens | 128,000 tokens | 400,000 tokens | 2,000,000 tokens |
| Parameters | — | 671B | — | — |
| Modality | text, vision | text | text, vision, audio | text, vision, audio, video |
| License | proprietary | MIT | proprietary | proprietary |
| Source | proprietary | open weights | proprietary | proprietary |
| Description | Reasoning-focused model in the o-series. | Large MoE open-weight model. Predecessor to DeepSeek-V4. | 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. | Predecessor to Gemini 3 Pro. |
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Mistral Large 2maxMax 4 models. Remove one to add another.