GPT-6 Luna vs GLM 5.2
| OpenAI GPT-6 Luna | Z.ai GLM 5.2 | |
|---|---|---|
| Vendor | OpenAI | Z.ai |
| Context window | 1,050,000 | 1,000,000 |
| Max output | 128,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | No |
| Input | text, image | text |
| Output | text | text |
| Released | 2026-09-22 | 2026-06-15 |