Anthropic’s latest model, Claude Fable 5.1, has finally cracked the Cyphral Distich cryptogram—an unsolved cipher attributed to Scottish writer Thomas Urquhart. The breakthrough was announced by the Vals AI team. This code had stumped cryptographers for over 370 years.

What Happened

According to Vals AI, it was Claude Fable 5.1 that managed to unlock the Cyphral Distich. This puzzle is a relic of early modern European cryptography and has been considered unsolvable for centuries.

Cipher Details

The Cyphral Distich is made up of two lines, each with 32 numbers. Experts say the cryptogram was printed at the end of Urquhart’s treatise, Logopandecteision, published in 1653.

Historical Context

Back in 1899, the cipher was put up for public debate in the pages of Notes and Queries. Later, the Cyphral Distich found its way into 20th-century cryptography literature and has kept researchers intrigued ever since.