Claude Fable 5.1 decodes royalist cipher hidden since 1653 that stumped researchers
The Decoder · rss · 2026-09-03
According to The Decoder, Anthropic's Claude Fable 5.1 appears to have cracked a centuries-old royalist number puzzle, hidden in plain sight since 1653, that researchers had long considered unsolved — a rare win for AI models on historical cryptography problems.
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