Coverage dated October 2, 2026

'A kind of Rosetta Stone': AI decodes 217-year-old secret letter ordered by Napoleon

Headline from Live Science

GPT-6 Astra has been used to solve a centuries-old cipher used to convey strategic military information between Napoleon's troops.

Live Science's own description from its feed. We collect headlines and these descriptions, not full articles; read the original reporting below.

Reports & sources

2 articles, oldest first.

Live Science
'A kind of Rosetta Stone': AI decodes 217-year-old secret letter ordered by Napoleon (opens Live Science)
Published Oct 2, 2026
Live Science's feed description
GPT-6 Astra has been used to solve a centuries-old cipher used to convey strategic military information between Napoleon's troops.
New York Post
Napoleon’s secret code deciphered after 217 years using AI to read emperor’s mysterious letter (opens New York Post)
Published Oct 2, 2026
New York Post's feed description
After more than 200 years, a coded letter written by petite, problematic Napoleon Bonaparte has been deciphered.