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Claude Fable Solves a Historical Cipher

Schneier on Security
· September 9, 2026

AI summary

Claude Fable 5.1 successfully cracked a historical cipher that was 370 years old in a relatively short time of 44 minutes. The ability of Claude Fable to solve the cipher quickly is attributed to its capability to perform extensive searching and testing, which is a characteristic of artificial intelligence. This demonstration aligns with the notion that AI excels in tasks that require thorough examination and trial. The cipher's age and the speed at which it was solved highlight the potential of AI in deciphering complex codes. The solution showcases the strength of AI in mathematical tasks, particularly those involving large-scale searches.

Read the full article at Schneier on Securitywww.schneier.com/blog/archives/2026/09/claude-fable-solves-a-historical-cipher.html

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