DeepSeek-V3.1 vs o3
Direct spec comparison of DeepSeek-V3.1 (from DeepSeek) and o3 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 DeepSeek-V3.1DeepSeek |  o3OpenAI | |
|---|---|---|
| Vendor | DeepSeek | OpenAI |
| Family | DeepSeek | o-series |
| Release date | 2025-08-21 | 2025-04-16 |
| Context window | 128,000 tokens | 200,000 tokens |
| Parameters | 671B | — |
| Modality | text | text, vision |
| License | MIT | proprietary |
| Source | open weights | proprietary |
| Description | Large MoE open-weight model. Predecessor to DeepSeek-V4. | Reasoning-focused model in the o-series. |
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