In a September 17, 2026 post, a user claimed GPT-6 Astra had cracked a previously unsolved German Army Enigma message from 1941 two days earlier. The user described an autonomous process that included comparing uncertain letters, finding contextual clues, building an Enigma simulator, writing cryptanalysis code, running parallel experiments and cross-checking the results. Another user sharing the claim expressed excitement about future language models deciphering ancient texts and tackling other unsolved mysteries.