Grok 4.5 vs GPT Image 2.5 Dev
| xAI Grok 4.5 | OpenAI GPT Image 2.5 Dev | |
|---|---|---|
| Vendor | xAI | OpenAI |
| Context window | 500,000 | — |
| Max output | 2,000,000 | — |
| Reasoning | Yes | No |
| Tool calling | Yes | No |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | image |
| Released | 2026-07-07 | 2026-09-08 |