AnalysisAI ModelsSeptember 13, 2026

Claude Fable 5.1 solves 370-year-old Cyphral Distich cipher

Claude Fable 5.1 cracked Sir Thomas Urquhart's Cyphral Distich in 44 minutes using 176k tokens, a cryptogram unsolved since it was posed as an open problem in Notes and Queries in 1899. The key clue was the 32 Proquiritations preceding the cipher, matching its two lines of 32 numbers each.

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