grok-4-fast-non-reasoning vs GPT-5.4
| xAI grok-4-fast-non-reasoning | OpenAI GPT-5.4 | |
|---|---|---|
| Vendor | xAI | OpenAI |
| Context window | 2,097,152 | 1,050,000 |
| Max output | 30,000 | 128,000 |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2025-08-27 | 2026-03-04 |