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 GPT-5.5OpenAI | GPT-5 OpenAI | o3 OpenAI |  DeepSeek-R1DeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | OpenAI | DeepSeek |
| Family | GPT | GPT | o-series | DeepSeek |
| Release date | 2026-04-23 | 2025-08-07 | 2025-04-16 | 2025-01-20 |
| Context window | 400,000 tokens | 400,000 tokens | 200,000 tokens | 128,000 tokens |
| Parameters | — | — | — | 671B |
| Modality | text, vision, audio | text, vision, audio | text, vision | text |
| License | proprietary | proprietary | proprietary | MIT |
| Source | proprietary | 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. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | Reasoning-focused model in the o-series. | Reasoning-focused open-weight model. |
| Links |
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Gemini 2.5 Flashmax
Claude 4.6 SonnetmaxGPT-5.5✓DeepSeek-V4-Flashmax
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Mistral Large 2maxMax 4 models. Remove one to add another.