Claude Sonnet 5 vs grok-4-fast-reasoning
| Anthropic Claude Claude Sonnet 5 | xAI grok-4-fast-reasoning | |
|---|---|---|
| Vendor | Anthropic Claude | xAI |
| Context window | 1,000,000 | 2,097,152 |
| Max output | 128,000 | 30,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image, file | text, image |
| Output | text | text |
| Released | 2026-06-30 | 2025-08-27 |