GPT Image 2.5 Dev vs GLM 5.3 Flash
| OpenAI GPT Image 2.5 Dev | Z.ai GLM 5.3 Flash | |
|---|---|---|
| Vendor | OpenAI | Z.ai |
| Context window | — | 1,000,000 |
| Max output | — | 128,000 |
| Reasoning | No | Yes |
| Tool calling | No | Yes |
| File input | Yes | No |
| Input | text, image | text |
| Output | image | text |
| Released | 2026-09-08 | 2026-08-26 |