Vals AI researcher who ran the Fable 5.1 evaluation
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Last updated Sep 14, 2026
As of September 2026: Author of the Aug 31 blog post announcing the proposed solve; awaiting independent verification
Vals AI says Anthropic's Claude Fable 5.1 decoded the Cyphral Distich, a 64-number cipher in Scottish writer Sir Thomas Urquhart's 1653 book Logopandecteision, in 44 minutes with no human help. If verified, it would end a puzzle that has resisted readers since 1899, when a British journal first asked for a solution.
Updated Sep 14
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