GPT-5.6 Luna vs Grok 4.20 (Non-Reasoning)
| OpenAI GPT-5.6 Luna | xAI Grok 4.20 (Non-Reasoning) | |
|---|---|---|
| Vendor | OpenAI | xAI |
| Context window | 1,050,000 | 2,000,000 |
| Max output | 128,000 | 2,000,000 |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image | text, image |
| Output | text | text |
| Released | 2026-07-08 | 2026-03-08 |