---
title: "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 (Jay Peters/The Verge)"
type: signal
url: https://frontiernewswire.com/s/anthropic-says-during-prerelease-testing-mythos-5-2-and-fable-5-2-8a3aceb6
published: 2026-11-09T19:15:01.000Z
byline: "Source: TECHMEME"
---

# 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 (Jay Peters/The Verge)

Source: TECHMEME · Published 2026-11-09 · Canonical: https://frontiernewswire.com/s/anthropic-says-during-prerelease-testing-mythos-5-2-and-fable-5-2-8a3aceb6

Jay Peters / The Verge : 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 — Claude Fable 5.2 is designed to take on big technical challenges, and it's available today.

## Sources

- [Read the original at TECHMEME](https://www.techmeme.com/261109/p39#a261109p39)

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