Claude Fable 5.1 Cracks 370-Year-Old Cipher

Claude Fable 5.1 independently cracked the 370-year-old 'Cyphral Distich' cipher by Thomas Urquhart in about 44 minutes, solving a long-standing puzzle that had stumped cryptographers for centuries.

2026-09-14 ~ 2026-09-15 · 4 related posts

• Claude Fable 5.1 cracks a 370-year-old cipher in 44 minutes, no human help — bcherny · 2026-09-14
• Fable 5.1 reportedly cracks a 370-year-old cipher in a day — zainhas · 2026-09-14
• Claude cracks two 370-year-old ciphers in 44 minutes with zero human help — 新智元 · 2026-09-15

1 near-duplicate retellings: zainhas