Detailed comparison of capabilities, features, and performance.
| Feature | Claude 4.5 Sonnet (thinking) | Claude Fable 5.1 |
|---|---|---|
| AI Lab | Anthropic | Anthropic |
| Context Size | 1,000,000 tokens | 1,000,000 tokens |
| Max Output Size | 64,000 tokens | 128,000 tokens |
| Frontier Model | Yes | Yes |
| Vision Support | Yes | Yes |
| Description | The latest Claude 4.5 Sonnet model from Anthropic with maximum reasoning enabled, 200k reasoning tokens in 1M context. | Anthropic's latest flagship, succeeding Claude Fable 5 with improved instruction following and cheaper cache reads. 1M token context window, 128k max output, and always-on adaptive thinking. |
View detailed specifications and capabilities
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View model details →Access both Claude 4.5 Sonnet (thinking) and Claude Fable 5.1 in a single workspace without managing multiple API keys.
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