Detailed comparison of capabilities, features, and performance.
| Feature | Grok 4 Fast (Reasoning) | Claude 4.5 Haiku |
|---|---|---|
| AI Lab | xAI | Anthropic |
| Context Size | 2,000,000 tokens | 200,000 tokens |
| Max Output Size | 30,000 tokens | 64,000 tokens |
| Frontier Model | Yes | No |
| Vision Support | No | Yes |
| Description | Reasoning-enabled Grok 4 with 2M context. Low latency for time-sensitive tasks and huge context window. | The latest Claude 4.5 Haiku model from Anthropic with a 1M token context window. |
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