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 DeepSeek-R1DeepSeek |  GPT-5.5OpenAI | GPT-5 OpenAI | o3 OpenAI | |
|---|---|---|---|---|
| Vendor | DeepSeek | OpenAI | OpenAI | OpenAI |
| Family | DeepSeek | GPT | GPT | o-series |
| Release date | 2025-01-20 | 2026-04-23 | 2025-08-07 | 2025-04-16 |
| Context window | 128,000 tokens | 400,000 tokens | 400,000 tokens | 200,000 tokens |
| Parameters | 671B | — | — | — |
| Modality | text | text, vision, audio | text, vision, audio | text, vision |
| License | MIT | proprietary | proprietary | proprietary |
| Source | open weights | proprietary | proprietary | proprietary |
| Description | 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. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | Reasoning-focused model in the o-series. |
| Links |
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Mistral Large 2maxMax 4 models. Remove one to add another.