Claude Opus 4.6 vs GPT-5.5
| Anthropic Claude Claude Opus 4.6 | OpenAI GPT-5.5 | |
|---|---|---|
| Vendor | Anthropic Claude | OpenAI |
| Context window | 1,000,000 | 1,050,000 |
| Max output | 128,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image, file | text, image |
| Output | text | text |
| Released | 2026-02-05 | 2026-04-24 |