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Applied AI·November 9, 2026·1 min read

Anthropic launches new Claude Fable and Mythos 5.2 models

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Faster 5.2 Fable and Mythos with better coding, reasoning, and vision are aimed squarely at ‘daunting’ technical challenges, not general chat. Teams doing complex analysis or multi-modal engineering work should be testing these against their hardest internal benchmarks, not just generic evals.

Applied AI

Anthropic says during prerelease testing Mythos 5.2 and Fable 5.2 formalized the proof of Fermat's Last Theorem and solved two open black hole physics problems

If these claims hold up under peer review, we’re crossing from “assistive” to “frontier-contributing” models in math and physics. For R&D orgs, the question shifts from ‘can AI help us write papers’ to ‘how do we operationalize AI as a co-author on unsolved problems without breaking our validation culture.’