GLM 5.3 Flash vs Claude Sonnet 5.5
| Z.ai GLM 5.3 Flash | Anthropic Claude Claude Sonnet 5.5 | |
|---|---|---|
| Vendor | Z.ai | Anthropic Claude |
| Context window | 1,000,000 | 1,000,000 |
| Max output | 128,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | No | Yes |
| Input | text | text, image, file |
| Output | text | text |
| Released | 2026-08-26 | 2026-09-28 |