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 Gemini 2.5 Pro |  Grok 4xAI |  o3OpenAI | GPT-5 OpenAI | |
|---|---|---|---|---|
| Vendor | xAI | OpenAI | OpenAI | |
| Family | Gemini | Grok | o-series | GPT |
| Release date | 2025-03-25 | 2025-07-09 | 2025-04-16 | 2025-08-07 |
| Context window | 2,000,000 tokens | 256,000 tokens | 200,000 tokens | 400,000 tokens |
| Parameters | — | — | — | — |
| Modality | text, vision, audio, video | text | text, vision | text, vision, audio |
| License | proprietary | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary | proprietary |
| Description | Predecessor to Gemini 3 Pro. | — | Reasoning-focused model in the o-series. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | 84.1% | 82.8% | — | 85.1% |
| GPQA-D | 84.0% | 87.5% | 87.7% | 87.3% |
| HumanEval | — | — | — | 95.2% |
| Aider | — | 72.5% | — | 85.4% |
| AIME-25 | — | 86.1% | 88.9% | 91.0% |
| LiveCB | — | 65.3% | — | 74.5% |
| MMMU | 72.4% | — | — | 74.1% |
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