GLM 5.1 vs GLM 5.3 Flash
| Z.ai GLM 5.1 | Z.ai GLM 5.3 Flash | |
|---|---|---|
| Vendor | Z.ai | Z.ai |
| Context window | 200,000 | 1,000,000 |
| Max output | 128,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | No | No |
| Input | text | text |
| Output | text | text |
| Released | 2026-04-07 | 2026-08-26 |