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Napoleon's 217-Year-Old Mysterious Letter Cracked Using AI In 6 Hours

An AI engineer using OpenAI's GPT-6 Astra cracked a 217-year-old encrypted letter sent to one of Napoleon Bonaparte's generals in 1809 . The AI transcribed 1,300 handwritten symbols and decoded the message in roughly six hours from a single image and prompt. The decoded letter revealed French and A…

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Timeline · 2 reports

  1. 2026-10-04 13:08 · Tom's Hardware
    ChatGPT-6 Astra cracks 217-year-old Napoleonic code in just six hours
  2. 2026-10-03 05:06 · r/ChatGPTPro
    Napoleon's 217-Year-Old Mysterious Letter Cracked Using AI In 6 Hours

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