Claude Fable 5 is Here! · Automate What Academy

Claude Fable 5 is Here!

Anthropic just dropped Fable 5 — their first Mythos-class model available to the public. And if you're running long agents, doing multi-step research, or working with complex codebases, your ceiling just moved.

Stripe migrated a 50-million-line Ruby codebase in a single day with Fable 5. That same job would take a team of human engineers two months. That's the kind of capability gap we're talking about here.

The jobs you wrote off as too complex to automate? Those are back on the table. Go find one from your backlog, hand it to Fable 5, and see how far it gets — because Opus 4.8 probably couldn't finish it, and Fable 5 just might.

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Claude Fable 5 is Here!