GPT-5.6 Luna vs GPT Image 2.5 Dev
| OpenAI GPT-5.6 Luna | OpenAI GPT Image 2.5 Dev | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Context window | 1,050,000 | — |
| Max output | 128,000 | — |
| Reasoning | Yes | No |
| Tool calling | Yes | No |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | image |
| Released | 2026-07-09 | 2026-09-08 |