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SCI & TECH● LOWSep 9 · Sep 9, 2026, 11:08 AM

Claude Fable Solves a Historical Cipher

Schneier · global

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. EDITED TO ADD (9/14): I’m not sure if this result is correct. The blog comments have more discussion.

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