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 o3OpenAI |  Mistral Large 2Mistral |  DeepSeek-V4-ProDeepSeek | GPT-5 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | Mistral | DeepSeek | OpenAI |
| Family | o-series | Mistral | DeepSeek | GPT |
| Release date | 2025-04-16 | 2024-07-24 | 2026-04-22 | 2025-08-07 |
| Context window | 200,000 tokens | 128,000 tokens | 1,000,000 tokens | 400,000 tokens |
| Parameters | — | 123B | 1.6T (49B active) | — |
| 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. | — | 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. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. |
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