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 o3OpenAI | GPT-5 OpenAI |  DeepSeek-R1DeepSeek | DeepSeek-V4-Pro DeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | DeepSeek | DeepSeek |
| Family | o-series | GPT | DeepSeek | DeepSeek |
| Release date | 2025-04-16 | 2025-08-07 | 2025-01-20 | 2026-04-22 |
| Context window | 200,000 tokens | 400,000 tokens | 128,000 tokens | 1,000,000 tokens |
| Parameters | — | — | 671B | 1.6T (49B active) |
| Modality | text, vision | text, vision, audio | text | text |
| License | proprietary | proprietary | MIT | MIT |
| Source | proprietary | proprietary | open weights | open weights |
| Description | Reasoning-focused model in the o-series. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | Reasoning-focused open-weight model. | DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs. |
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Mistral Large 2maxMax 4 models. Remove one to add another.