GPT-6 Astra broke a 1941 Enigma message that had resisted solution since 2005.

Frode Weierud of Crypto Cellar confirmed that after Carter Leffer asked it to try the unbroken messages on the site, Astra picked the target itself, suspected a link to an already-broken message, wrote its own Enigma simulator and Bombe in Python and C++, and cracked it with the crib ROSENOW ROSENOW. The key used wheel order 253, the ciphertext had transcription errors, and there was a rare left-wheel turnover at letter 72. Weierud estimates two days of its work would take a human weeks or months.