grok-4-fast-non-reasoning vs GPT Image 2.5 Dev
| xAI grok-4-fast-non-reasoning | OpenAI GPT Image 2.5 Dev | |
|---|---|---|
| Vendor | xAI | OpenAI |
| Context window | 2,097,152 | — |
| Max output | 30,000 | — |
| Reasoning | No | No |
| Tool calling | Yes | No |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | image |
| Released | 2025-08-27 | 2026-09-08 |