Compare models
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 GPT-5.5OpenAI |  Grok 4xAI |  Llama 4 MaverickMeta | |
|---|---|---|---|
| Vendor | OpenAI | xAI | Meta |
| Family | GPT | Grok | Llama |
| Release date | 2026-04-23 | 2025-07-09 | 2025-04-05 |
| Context window | 400,000 tokens | 256,000 tokens | 1,000,000 tokens |
| Parameters | — | — | 400B |
| Modality | text, vision, audio | text | text, vision |
| License | proprietary | proprietary | Llama 4 Community License |
| Source | proprietary | proprietary | open weights |
| 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. | — | Mixture-of-experts open-weight model from Meta. |
| Links |
