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