AI Model GPT-6 Astra Decrypts 108-Year-Old German Military Cipher

Developer Prinz used OpenAI's GPT-6 Astra to decrypt an unsolved ADFGVX cipher sent by German military officials in 1918. The message described the English cruiser H.M.S. Canterbury arriving at Sevastopol and an Allied squadron following on November 26.

• The ADFGVX cipher went unread for 108 years
• The keyword was TRUPPENVERSCHIEBUNG
• Plaintext matched the H.M.S. Canterbury log
• OpenAI says Astra beat Portal in 24 hours