AnalysisAI ModelsOctober 1, 2026

GPT-6 Astra helps decode 217-year-old Napoleonic cipher letter

Read original source →runtimewire.com

Carter Church published a key, transcription and reproduction script for a March 1809 letter to Napoleon's marshal Auguste de Marmont, saying GPT-6 Astra did the work in about six hours of model execution. The cipher held 1,300 units and 155 distinct signs; a partial table from historian Daniel Tant supplied 33 letter values covering roughly 435 units.

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