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The GPT-6 Astra Neural Network Deciphered Napoleon's Message, Which Could Not Be Read for 217 Years

OpenAI’s GPT-6 Astra transcribed the 1,300-character note in six hours after cryptographers had solved 33 characters.

  • GPT-6 Astra decoded a 217-year-old ciphered letter from Napoleon Bonaparte to General Marmont, ending two centuries of mystery surrounding the 1809 message sent to the senior general stationed in Croatia.
  • The letter's cipher was lost, leaving its contents unknown for over two centuries. Napoleon sent the note via his stepson, Eug, instructing Marmont regarding French and Austrian troop movements as the Habsburgs prepared for war.
  • Carter Church, an AI engineer at cybersecurity company SentinelOne, used GPT-6 Astra to transcribe the 1300-character note. The system mapped text against 33 previously solved characters, using "simulated annealing" to trial candidate words and match Marmont's known writing style.
  • Napoleon instructed Marmont not to be "intimidated by a few troops or a gathering of rabble." The letter added "Austria will be attacked at once on every side," as Marmont later helped France defeat Austria at the Battle of Wagram.
  • Researchers warn that AI's deciphering capabilities could eventually be used to unmask anonymous online profiles by matching writing patterns. This mirrors the success in cracking historical codes like the Enigma message, raising long-term security concerns.
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An encrypted letter to French General Auguste de Marmont has been deciphered 217 years after it was written using artificial intelligence. The document was written in March 1809 on the orders of Napoleon Bonaparte, who instructed his stepson Eugene de Beauharnais to give Marmont information about the location of the French and allied armies. The GPT-6 Astra model was used to decipher it. According to Carter Church, an artificial intelligence eng…

Sydney Morning HeraldSydney Morning Herald
+3 Reposted by 3 other sources
Lean Left

Napoleon’s 217-year-old coded message ‘cracked by AI’

The contents of the letter had remained a mystery since it was sent to one of his senior generals in 1809.

·North Sydney, Australia
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Lean Right

American engineer Carter Church, using artificial intelligence, solves an encrypted letter from French Emperor Napoleon Bonaparte, written over two centuries ago. Artificial intelligence has helped decipher the secret message of French Emperor Napoleon Bonaparte to General Augustus Frederick Louis Marmon, and gives TASS. A letter consisting of 1,300 mysterious symbols remained unsolved for more than two centuries because of the loss of the ciphe…

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Using an image, GPT-6 Astra decoded a cryptic letter from General Marmont that had been unsolved for 217 years in about six hours. The post GPT-6 Astra model decodes secret Napoleon-era letter after 217 years appeared first on Digiato.

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Karar Gazetesi broke the news on Thursday, October 1, 2026.
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