OpenAI GPT–6 Astra breaks Enigma message that has resisted solution since 2005
OpenAI's GPT-6 Astra autonomously broke the unsolved 1941 Enigma message MVUEH, writing its own simulator, Bombe code and archive research.
OpenAI's GPT-6 Astra independently solved Enigma message MVUEH (Nr. 172, 10 July 1941, 82 letters), unbroken since 2005, after writing its own Python and C++ Enigma simulator and Bombe and using the repeated crib ROSENOW. The recovered key used wheel order 253, differing from the daily key 512, and validation by Frode Weierud of Crypto Cellar Research confirmed the plaintext, nearly identical to message SIPVX (Nr. 173). The model also traced correct Bundesarchiv file references (RS 3-3/20a, RS 3-3/63b), accomplishing in two days work that took humans weeks or months.
- GPT-6 Astra broke 82-letter Enigma message MVUEH unsolved since 2005
- Model wrote its own Python/C++ Enigma simulator and Bombe, used ROSENOW crib
- Recovered key used wheel order 253, diverging from daily key 512
- Model located correct Bundesarchiv volumes RS 3-3/20a and RS 3-3/63b
- Break validated by Crypto Cellar Research's Frode Weierud
From the original article
4 min read at cryptocellar.orgOpenAI GPT–6 Astra breaking an Enigma message that has resisted solution since 2005. On 15 September 2026, Carter Leffer contacted me to request validation of a break of the German Army Enigma message MVUEH of 10 July 1941. The message, which was sent by a radio station with the tactical callsign 2ny, was received by the radio station of the SS-Totenkopf Quartiermeister, Ib.
By sohkamyung · cryptocellar.org
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