Compare models
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 GPT-5.5OpenAI |  Gemini 2.5 Flash |  DeepSeek-V3.1DeepSeek | |
|---|---|---|---|
| Vendor | OpenAI | DeepSeek | |
| Family | GPT | Gemini | DeepSeek |
| Release date | 2026-04-23 | — | 2025-08-21 |
| Context window | 400,000 tokens | 1,000,000 tokens | 128,000 tokens |
| Parameters | — | — | 671B |
| Modality | text, vision, audio | text, vision, audio | text |
| License | proprietary | proprietary | MIT |
| Source | proprietary | proprietary | open weights |
| Description | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | — | Large MoE open-weight model. Predecessor to DeepSeek-V4. |
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