Claude Fable 5.1 Solves the 370 Year old Puzzle Cyphral Distich in 44 minutes.
This cipher has remained seemingly unsolved for centuries. It was posed as an open problem in Notes and Queries in 1899, appeared again in 20th-century cryptography literature, and was later listed by historical-cipher researcher Klaus Schmeh among his Top 50 unsolved encrypted messages.
After 44 minutes, 176k tokens, and zero interjections from me, Fable 5.1 arrived at a solution. It tried a few approaches, but was finally able to solve it with two central realizations.
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https://www.vals.ai/blogs/fable-solves-cyphral-distich
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09-22-2026, 02:24
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