Claude Opus 5.5 vs DeepSeek V4.1 Flash
| Anthropic Claude Claude Opus 5.5 | DeepSeek DeepSeek V4.1 Flash | |
|---|---|---|
| Vendor | Anthropic Claude | DeepSeek |
| Context window | 1,000,000 | 1,040,000 |
| Max output | 128,000 | 384,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image, file | text |
| Output | text | text |
| Released | 2026-09-22 | 2026-09-10 |