GPT-6 Astra cracks 21-year-old Enigma code in two days

Researcher Carter Leffen used OpenAI's GPT-6 Astra to decrypt a 1941 German Enigma message, codenamed MVUEH, which had remained unsolved since 2005. The model identified the key by analyzing the 82-character message and simulating Enigma decryption processes. While cryptographer Frode Weierud praised the model's autonomous performance, Leffen's case study suggests a more collaborative approach involving multiple expert agents and extensive search iterations.