Compare models
Pick up to 4models. Specs render side-by-side. Share the URL — it's stateless.
 Gemini 2.5 Pro |  Grok 4xAI |  o3OpenAI | |
|---|---|---|---|
| Vendor | xAI | OpenAI | |
| Family | Gemini | Grok | o-series |
| Release date | 2025-03-25 | 2025-07-09 | 2025-04-16 |
| Context window | 2,000,000 tokens | 256,000 tokens | 200,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio, video | text | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | Predecessor to Gemini 3 Pro. | — | Reasoning-focused model in the o-series. |
| Links |
