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GPT-6 Astra solves 1918 ciphertext message from WW1

GPT-6 Astra deciphered a 1918 German radio transmission that had not previously been decoded, translating it to read "AN ENGLISH CRUISER ARRIVED AT SEVASTOPOL ON THE ?4TH AN ALLIED SQUADRON FOLLOWS ON THE 26TH." The model verified its work by matching the message to the arrival of the English cruiser HMS Canterbury at Sevastopol on November 24, 1918 and an allied squadron on November 26, 1918. The message is one of roughly 20 WWI German radio messages included as entries in the source material.

read1 min views1 publishedSep 18, 2026
GPT-6 Astra solves 1918 ciphertext message from WW1
Image: source

GPT-6 Astra deciphered a 1918 German radio transmission that, to my knowledge, has never been deciphered before. The message below translates to: "EIN ENGLISCHER KREUZER EINLIEG X SEWASTOPOL X S4STEN X EIN GESCHWADER DER X ALLIIERTEN FOLGT 26STEN X" or, in English: "AN ENGLISH CRUISER ARRIVED AT SEVASTOPOL ON THE ?4TH AN ALLIED SQUADRON FOLLOWS ON THE 26TH" Astra even double-checked its work by determining that an English cruiser, HMS Canterbury, reported its arrival in Sevastopol on November 24, 1918 and the arrival of an allied squadron on November 26, 1918. This message is one of the ~20 WWI German radio messages that appear as one of the entries in the

source & further reading
twitter.com — original article
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