Utopia Tech
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Claude Fable Solves a Historical Cipher

Claude Fable 5.1 solved a 370-year-old cipher in forty-four minutes. This tracks with what I wrote about AIs doing mathematics: It’s good at things that involve lots of searching and testing.

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Utopia Tech

September 9, 2026 · 1 min read

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Claude Fable 5.1 solved a 370-year-old cipher in forty-four minutes. This tracks with what I wrote about AIs doing mathematics: It’s good at things that involve lots of searching and testing.

Originally published at schneier.com

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