GPT-6 Astra decrypts a 217-year-old cipher to one of Napoleon's generals

Carter Church @CarterWChurchOriginally posted 2026.09.30

Open original on X

I used GPT-6 Astra to break an unsolved cipher to one of Napoleon's generals that had gone unread for 217 years. What makes this impressive isn't actually the codebreaking, but that Astra completed the entire multi-modal workflow in ~6 hours from a single image and goal. 1/6🧵