Enigma

Carter Leffen, a product development coach at Bloomberg LP, says he used OpenAI's GPT-6 Astra to decrypt an 82-character Enigma-encrypted Wehrmacht radio message from July 1941 that had gone unsolved for 83 years. The AI agent reportedly spent about 10 hours building an Enigma simulator, testing keys, and cross-checking results before landing on a decryption confirmed by an archived message header.