AnalysisPolicySeptember 2, 2026

Claude's new system prompt blocks song lyric reproduction

Anthropic's updated system prompt for Claude consumer apps (Fable 5.1) adds a strict policy against reproducing song lyrics, poems, or book passages, with persistent refusal for reworded requests. It also prohibits drawing copyrighted characters or logos and sets a reliable knowledge cutoff of June 2026.

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Claude's new system prompt blocks song lyric reproduction