Compare models
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 GPT-5OpenAI |  DeepSeek-V3.1DeepSeek | o3 OpenAI | |
|---|---|---|---|
| Vendor | OpenAI | DeepSeek | OpenAI |
| Family | GPT | DeepSeek | o-series |
| Release date | 2025-08-07 | 2025-08-21 | 2025-04-16 |
| Context window | 400,000 tokens | 128,000 tokens | 200,000 tokens |
| Parameters | — | 671B | — |
| Modality | text, vision, audio | text | text, vision |
| License | proprietary | MIT | proprietary |
| Source | proprietary | open weights | proprietary |
| Description | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | Large MoE open-weight model. Predecessor to DeepSeek-V4. | Reasoning-focused model in the o-series. |
| Links |
