An engineer used GPT-6 Astra to read a 1809 Napoleon-era cipher

SentinelOne engineer Carter Church used OpenAI's GPT-6 Astra to read an unsolved French cipher from 1809 in about six hours, per Tom's Hardware. The scan was a 1969 magazine plate with 24 rows of invented symbols. A fact-check blog says an earlier human key already covered about a third of it.