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 o3OpenAI |  Claude 4.5 HaikuAnthropic |  Mistral Large 2Mistral | GPT-5.5 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | Anthropic | Mistral | OpenAI |
| Family | o-series | Claude | Mistral | GPT |
| Release date | 2025-04-16 | 2025-10-01 | 2024-07-24 | 2026-04-23 |
| Context window | 200,000 tokens | 200,000 tokens | 128,000 tokens | 400,000 tokens |
| Parameters | — | — | 123B | — |
| Modality | text, vision | text, vision | text | text, vision, audio |
| License | proprietary | proprietary | Mistral Research License | proprietary |
| Source | proprietary | proprietary | open weights | proprietary |
| Description | Reasoning-focused model in the o-series. | Fast, cost-effective Claude model. | — | 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. |
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