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 Grok 4xAI |  GPT-4.1OpenAI |  Gemini 2.5 Pro | GPT-5.5 OpenAI | |
|---|---|---|---|---|
| Vendor | xAI | OpenAI | OpenAI | |
| Family | Grok | GPT | Gemini | GPT |
| Release date | 2025-07-09 | 2025-04-14 | 2025-03-25 | 2026-04-23 |
| Context window | 256,000 tokens | 1,000,000 tokens | 2,000,000 tokens | 400,000 tokens |
| Parameters | — | — | — | — |
| Modality | text | text, vision | text, vision, audio, video | text, vision, audio |
| License | proprietary | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary | proprietary |
| Description | — | — | Predecessor to Gemini 3 Pro. | 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. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | 82.8% | — | 84.1% | 87.6% |
| GPQA-D | 87.5% | — | 84.0% | 89.4% |
| HumanEval | — | — | — | 96.8% |
| Aider | 72.5% | — | — | 89.7% |
| AIME-25 | 86.1% | — | — | 94.2% |
| LiveCB | 65.3% | — | — | 78.9% |
| MMMU | — | — | 72.4% | 78.4% |
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Claude 4.8 Opusmax
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Mistral Large 2maxMax 4 models. Remove one to add another.