Compare models
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 GPT-5.5OpenAI | o3 OpenAI |  Grok 4xAI | |
|---|---|---|---|
| Vendor | OpenAI | OpenAI | xAI |
| Family | GPT | o-series | Grok |
| Release date | 2026-04-23 | 2025-04-16 | 2025-07-09 |
| Context window | 400,000 tokens | 200,000 tokens | 256,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision | text |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | 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 |
