The idea in one line. Fable 5 is Anthropic's planning and hard-problems model, so its real edge is not typing your work, it is turning a vague backlog into specs so exact that a cheap model (Sonnet or Haiku) can build them later without a single judgment call. You plan once tonight with the expensive brain, then cheap models cash the checks for a long time. Three pieces do it: the mining prompt, the blueprint template, and the batch loop.
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Unlocks: The mining prompt · The blueprint template · The overnight batch loop · Read this before you trust the batch
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