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Anthropic updates Claude system prompts with lyric rules | ByteBrief

AISimon Willisonabout 3 hours ago

Anthropic updates Claude system prompts with lyric rules

11 min read

Anthropic published updated system prompts for Claude.ai and Claude mobile apps, now organized into an index and per-model pages. The Haiku 4.5 page shows prompts from October 15th 2025 and January 18th 2026. The new prompt explicitly restricts reproducing song lyrics.

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