Grok 4.20 (Non-Reasoning) vs GPT-5.5
| xAI Grok 4.20 (Non-Reasoning) | OpenAI GPT-5.5 | |
|---|---|---|
| Vendor | xAI | OpenAI |
| Context window | 2,000,000 | 1,050,000 |
| Max output | 2,000,000 | 128,000 |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2026-03-08 | 2026-04-23 |