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OpenAI | Meta | Anthropic | xAI | |
|---|---|---|---|---|
| Vendor | OpenAI | Meta | Anthropic | xAI |
| Family | GPT | Llama | Claude | Grok |
| Release date | 2026-04-23 | 2025-04-05 | 2026-04-16 | 2025-07-09 |
| Context window | 400,000 tokens | 1,000,000 tokens | 1,000,000 tokens | 256,000 tokens |
| Parameters | — | 400B | — | — |
| Modality | text, vision, audio | text, vision | text, vision | text |
| License | proprietary | Llama 4 Community License | proprietary | proprietary |
| Source | proprietary | open weights | 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. | Mixture-of-experts open-weight model from Meta. | Anthropic's most capable model, optimized for complex reasoning and coding. Improved software engineering, long-running coding tasks, and higher-resolution vision over Claude 4.6. | — |
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