Fable 5.1 Cracks 373-Year-Old Unsolved Cipher

Vals AI reports that Anthropic's Fable 5.1 model has solved a 373-year-old distich cipher, ranked 28th among the world's top unsolved encryption messages by cryptology author Klaus Schmeh. The full solution, shared on X and the team's blog, turned out to be surprisingly simple.

2026-09-02 ~ 2026-09-02 · 2 related posts