AI

Anthropic Drops Claude Fable 5.2 and Mythos 5.2: Faster, Cheaper, Smarter

📅 Nov 10, 2026

✍️ Aamir Raza

Claude Fable 5.2 Is Here

Anthropic dropped two new models on November 9 — Fable 5.2 and Mythos 5.2 — its most advanced yet.

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30% Faster, 20% Cheaper

Outputs run up to 30% faster than the 5.1 models, and the price fell to $8 per million input tokens.

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One Model, Two Doors

Fable and Mythos share the same model. Fable is open to everyone; Mythos is for vetted security and science teams.

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1,000 AI Agents Proved a Theorem

A team of 1,000 Fable 5.2 agents formalized Fermat's Last Theorem in 30 hours — and helped crack two black hole problems.

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The Launch Before the IPO

The release lands as Anthropic prepares a planned public offering, with a roadshow expected this week.

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