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AI Cracked a 370-Year-Old Cipher in 44 Minutes. The Hard Part Wasn't the Model.

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

The claim, and why I didn't just retweet it On August 31, the evaluation firm Vals AI published a post: researcher Geby Jaff had cracked Cyphral Distich, a cipher from 1653 that had resisted 370 years of attempts, using Claude's Fable 5.1. Forty-four minutes, 176,000 tokens, zero human intervention…

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  1. 2026-09-20 03:02 · DEV Community — AI
    AI Cracked a 370-Year-Old Cipher in 44 Minutes. The Hard Part Wasn't the Model.

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