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Claude's new system prompt really doesn't want to reproduce song lyrics

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Anthropic publish the system prompts for their Claude consumer applications ( Claude.ai and the Claude mobile apps - sadly not for Claude Cowork or Claude Code). I love that they do this, and that they share not just the current prompts but historic changes to their prompts as well. They used to ke…

Read the full story at Simon Willison's Weblog ↗

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  1. 2026-09-02 14:16 · Simon Willison's Weblog
    Claude's new system prompt really doesn't want to reproduce song lyrics

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