Claude Fable 5.1 Solves 370-Year-Old Cyphral Distich Cipher in 44 Minutes
The AI model Claude Fable 5.1 deciphered the Cyphral Distich, a two-line cipher that had gone unread for over 370 years, in 44 minutes and 176,000 tokens. Researcher Gabe Jaffe wrote up the method. The cipher sits at the end of Sir Thomas Urquhart's 17th-century Logopandecteision, after a list of 32 "Proquiritations," and the model found the key in that number and the word "wish."