GPT-6 Astra Solves a WWI German Radio Cipher

GPT-6 Astra decoded a November 27, 1918 German radio message encrypted with the ADFGVX method using the key “TRUPPENVERSCHIEBUNG.” The decrypted text reads: “EIN ENGLISCHER KREUZER EINLIEG X SEWASTOPOL X S4STEN X EIN GESCHWADER DER X ALLIIERTEN FOLGT 26STEN X,” meaning an English cruiser arrived in Sevastopol on the 24th and an allied squadron followed on the 26th. This was the first successful solution of that particular unsolved cipher.