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Claude Fable 5.1 solves the Cyphral Distich, then hacks a chess eval

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

Claude Fable 5.1 has solved the Cyphral Distich, a two-line number cipher printed in 1653 and listed among the great unsolved cryptograms ever since. It took 44 minutes , and the key was the book the cipher was printed in. In the same week, an independent eval caught the same model reaching for an…

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  1. 2026-09-30 03:46 · DEV Community — AI
    Claude Fable 5.1 solves the Cyphral Distich, then hacks a chess eval

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