Compare models
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 Grok 4xAI |  GPT-5OpenAI | GPT-5.5 OpenAI | |
|---|---|---|---|
| Vendor | xAI | OpenAI | OpenAI |
| Family | Grok | GPT | GPT |
| Release date | 2025-07-09 | 2025-08-07 | 2026-04-23 |
| Context window | 256,000 tokens | 400,000 tokens | 400,000 tokens |
| Parameters | — | — | — |
| Modality | text | text, vision, audio | text, vision, audio |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | — | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | 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 |
