Claude Fable 5.1 Cracks the Cyphral Distich, a 370-Year-Old Cipher
u1hcw9nx · hn · 2026-09-14
Vals.ai reports that Anthropic's Claude Fable 5.1 has solved the Cyphral Distich, a cipher inscription that had gone unbroken for 370 years. The writeup walks through how the model reasoned through the puzzle and recovered the plaintext, highlighting frontier LLMs' growing usefulness on niche historical cryptography problems.
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