Compare models
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 GPT-5.5OpenAI |  Claude 4.7 OpusAnthropic | Claude 4.6 Sonnet Anthropic | |
|---|---|---|---|
| Vendor | OpenAI | Anthropic | Anthropic |
| Family | GPT | Claude | Claude |
| Release date | 2026-04-23 | 2026-04-16 | — |
| Context window | 400,000 tokens | 1,000,000 tokens | 200,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision |
| 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. | 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. | — |
| Links |
