Detailed comparison of capabilities, features, and performance.
| Feature | Grok 4 Fast | Claude 4.5 Sonnet |
|---|---|---|
| AI Lab | xAI | Anthropic |
| Context Size | 2,000,000 tokens | 1,000,000 tokens |
| Max Output Size | 30,000 tokens | 64,000 tokens |
| Frontier Model | Yes | Yes |
| Vision Support | No | Yes |
| Description | Faster Grok 4 with identical quality (2m context). Low latency for time-sensitive tasks and huge context window. | The latest Claude 4.5 Sonnet model from Anthropic with a 1M token context window. |
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