---
title: "Discussion on \"How Claude Fable 5.1 Cracked a 370-Year-Old Cipher\" | Hashnode"
description: "Discussion on \"How Claude Fable 5.1 Cracked a 370-Year-Old Cipher\". Anthropic's Claude Fable 5.1 spent 44 minutes on a cryptogram that had defeated cryptographers since 1653, finding the key hidden inside the book itself."
url: "https://hashnode.com/posts/how-claude-fable-51-cracked-a-370-year-old-cipher/6aacfbbfde4eaf213463a475"
---

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# [How Claude Fable 5.1 Cracked a 370-Year-Old Cipher](https://blog.zyvop.com/how-claude-fable-51-cracked-a-370-year-old-cipher?utm_source=hashnode&utm_medium=feed)

Anthropic's Claude Fable 5.1 spent 44 minutes on a cryptogram that had defeated cryptographers since 1653, finding the key hidden inside the book itself.

Sep 18 · 5 min read · blog.zyvop.com  
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