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AI Cracked a 370-Year-Old Cipher in 40 Minutes — Here's How to Unlock the Same Reasoning Power

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

The story that broke HN yesterday Claude Fable 5.1 cracked the Cyphral Distich — a cipher that's been unsolved since the 1650s. 370 years of human failure. 40 minutes of AI reasoning. 471 points, 200 comments on Hacker News. Everyone's talking about how smart AI is getting. But here's what actually…

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  1. 2026-09-15 08:20 · DEV Community — AI
    AI Cracked a 370-Year-Old Cipher in 40 Minutes — Here's How to Unlock the Same Reasoning Power

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