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 DeepSeek-V3.1DeepSeek |  o3OpenAI |  Gemini 3.5 Flash | |
|---|---|---|---|
| Vendor | DeepSeek | OpenAI | |
| Family | DeepSeek | o-series | Gemini |
| Release date | 2025-08-21 | 2025-04-16 | 2026-05-20 |
| Context window | 128,000 tokens | 200,000 tokens | — |
| Parameters | 671B | — | — |
| Modality | text | text, vision | text, vision, audio |
| License | MIT | proprietary | proprietary |
| Source | open weights | proprietary | proprietary |
| Description | Large MoE open-weight model. Predecessor to DeepSeek-V4. | Reasoning-focused model in the o-series. | Fast, low-cost tier of the Gemini 3.5 family announced at Google I/O 2026. June 2026 update added native computer-use capability, moving Flash from generation to agentic task execution. |
| Links | |||
| Benchmarks | |||
| GPQA-D | — | 87.7% | — |
| AIME-25 | — | 88.9% | — |
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