Claude Fable 5 is part of a model family that now spans four classes: Haiku, Sonnet, Opus, and Mythos. Here’s how to think about when to use it: Fable is for the most ambitious, asynchronous tasks—big projects you want the model to break down, research, create, and verify on its own over extended periods. Opus is better suited for faster, synchronous collaboration on complex tasks.
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