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 GPT-5.5OpenAI |  Mistral Large 2Mistral | GPT-5 OpenAI |  Claude 4.5 HaikuAnthropic | |
|---|---|---|---|---|
| Vendor | OpenAI | Mistral | OpenAI | Anthropic |
| Family | GPT | Mistral | GPT | Claude |
| Release date | 2026-04-23 | 2024-07-24 | 2025-08-07 | 2025-10-01 |
| Context window | 400,000 tokens | 128,000 tokens | 400,000 tokens | 200,000 tokens |
| Parameters | — | 123B | — | — |
| Modality | text, vision, audio | text | text, vision, audio | text, vision |
| License | proprietary | Mistral Research License | proprietary | proprietary |
| Source | proprietary | open weights | proprietary | proprietary |
| 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 Superseded by GPT-5.5 in April 2026. | Fast, cost-effective Claude model. |
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