Claude Fable 5.1 Solves the Cyphral Distich, a 370-year-old cipher
Problem We gave Claude Fable 5.1 an open task: solve Sir Thomas Urquhart’s Cyphral Distich. It appears to have actually solved it, and the solution is quite embarrassing for humans in hindsight. At the end of Urquhart’s Logopandecteision is a cryptogram consisting of two lines of 32 numbers each, called the Cyphral Distich.
- ▪Problem We gave Claude Fable 5.1 an open task: solve Sir Thomas Urquhart’s Cyphral Distich.
- ▪It appears to have actually solved it, and the solution is quite embarrassing for humans in hindsight.
- ▪At the end of Urquhart’s Logopandecteision is a cryptogram consisting of two lines of 32 numbers each, called the Cyphral Distich.
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| Original publisher | Vals |
| Canonical URL | https://www.vals.ai/blogs/fable-solves-cyphral-distich |
| Publication time | Sun, 13 Sep 2026 21:06:13 +0000 |
| Retrieval time | 2026-09-13T21:51:50.769Z |
| Last seen | 2026-09-13T21:51:50.769Z |
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| Cluster | sAzRD09_PEIC · 1 stories |
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Opening excerpt (first ~120 words) tap to expand
Problem We gave Claude Fable 5.1 an open task: solve Sir Thomas Urquhart’s Cyphral Distich. It appears to have actually solved it, and the solution is quite embarrassing for humans in hindsight. At the end of Urquhart’s Logopandecteision is a cryptogram consisting of two lines of 32 numbers each, called the Cyphral Distich. A cryptogram is a short message deliberately encoded so it can’t be read without knowing the rule that produced it. Here the entire puzzle input is these 64 numbers, and the goal is to recover the hidden plaintext: 5.3.27.38.32.14.21.8.66.8.70.39.5.9.12.18.2.3.56.5.1.7.3.2.13.19.3.25.9.3.16.6. 25.15.13.6.11.20.5.1.2.12.1.20.20.49.20.20.35.33.4.6.8.35.5.33.5.5.18.10.3.11.32.42. This cipher has remained seemingly unsolved for centuries.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Vals.
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