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 Claude 4.5 HaikuAnthropic |  Mistral Large 2Mistral |  GPT-5.5OpenAI | o3 OpenAI | |
|---|---|---|---|---|
| Vendor | Anthropic | Mistral | OpenAI | OpenAI |
| Family | Claude | Mistral | GPT | o-series |
| Release date | 2025-10-01 | 2024-07-24 | 2026-04-23 | 2025-04-16 |
| Context window | 200,000 tokens | 128,000 tokens | 400,000 tokens | 200,000 tokens |
| Parameters | — | 123B | — | — |
| Modality | text, vision | text | text, vision, audio | text, vision |
| License | proprietary | Mistral Research License | proprietary | proprietary |
| Source | proprietary | open weights | proprietary | proprietary |
| Description | Fast, cost-effective Claude model. | Large text-only Mistral model with a 128K context window and 123B parameters, tuned for strong instruction following and long-context reasoning. Mistral's flagship open-weights release in the Large 2 line. | 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. | Reasoning-focused model in the o-series. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | — | 87.6% | — |
| GPQA-D | — | — | 89.4% | 87.7% |
| HumanEval | — | 89.0% | 96.8% | — |
| Aider | — | — | 89.7% | — |
| AIME-25 | — | — | 94.2% | 88.9% |
| LiveCB | — | — | 78.9% | — |
| MMMU | — | — | 78.4% | — |
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