AnalysisAI ModelsSeptember 13, 2026

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

Vals AI gave Claude Fable 5.1 Sir Thomas Urquhart's Cyphral Distich — 64 numbers in two lines of 32 — and it cracked the cipher in 44 minutes using 176k tokens with no human interjections. The key clue: the cryptogram follows Urquhart's 32 Proquiritations, a number he explicitly emphasizes.

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