GPT Image 1.5 vs Grok 4.5
| OpenAI GPT Image 1.5 | xAI Grok 4.5 | |
|---|---|---|
| Vendor | OpenAI | xAI |
| Context window | 128,000 | 500,000 |
| Max output | — | 2,000,000 |
| Reasoning | No | Yes |
| Tool calling | No | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | image | text |
| Released | 2025-12-16 | 2026-07-08 |