# system-prompts 57

Published articles for system-prompts 57.

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

DevFeed: [Claude's new system prompt really doesn't want to reproduce song lyrics](<https://devfeed.tech/articles/claude-s-new-system-prompt-really-doesn-t-want-to-reproduce-song-lyrics-30509.md>)

Original publisher: [Read original article](<https://simonwillison.net/2026/Sep/2/claudes-new-system-prompt/>)

Author: Simon Willison

Published: 2026-09-02T14:16:42Z

Content type: opinion

Language: en

Sources: [Simon Willison](<https://devfeed.tech/sources/simon-willison.md>)

Topics: [Claude](<https://devfeed.tech/topics/claude.md>), [anthropic](<https://devfeed.tech/topics/anthropic.md>), [Fable](<https://devfeed.tech/topics/fable.md>)

Tags: [ai](<https://devfeed.tech/tags/ai.md>), [ai-2-235](<https://devfeed.tech/tags/ai-2-235.md>), [ai-ethics](<https://devfeed.tech/tags/ai-ethics.md>), [ai-ethics-342](<https://devfeed.tech/tags/ai-ethics-342.md>), [anthropic](<https://devfeed.tech/tags/anthropic.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-310](<https://devfeed.tech/tags/claude-310.md>), [generative-ai](<https://devfeed.tech/tags/generative-ai.md>), [generative-ai-1-981](<https://devfeed.tech/tags/generative-ai-1-981.md>), [git-scraping](<https://devfeed.tech/tags/git-scraping.md>), [git-scraping-38](<https://devfeed.tech/tags/git-scraping-38.md>), [llms](<https://devfeed.tech/tags/llms.md>), [llms-1-947](<https://devfeed.tech/tags/llms-1-947.md>), [prompt-engineering](<https://devfeed.tech/tags/prompt-engineering.md>), [prompt-engineering-197](<https://devfeed.tech/tags/prompt-engineering-197.md>), [system-prompts](<https://devfeed.tech/tags/system-prompts.md>), [system-prompts-57](<https://devfeed.tech/tags/system-prompts-57.md>), [updated](<https://devfeed.tech/tags/updated.md>)

### AI overview

The article examines changes in Anthropic's published Claude consumer system prompts, focusing on new restrictions against reproducing song lyrics and generating copyrighted characters or logos. It also discusses changes to Claude's response style and conversation-ending guidance.

### Source excerpt

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 keep all of the prompts on a single page, but when I checked today I noticed they had re-arranged those prompts into an index page and then a page per model - here's the page for Haiku 4.5 for example, which has the original prompt from October 15th 2025 and an updated prompt from January 18th 2026. A neat thing about Anthropic's platform.claude.com/docs site is that it's designed to be usable by LLMs. You can add .md to any page to get back the content as Markdown - here's the system prompt index page and the Markdown prompts for Fable 5.1. TL;DR: this makes it really easy to diff the prompts. Don't reproduce song lyrics Don't draw copyrighted characters or logos Tweaks to Claude's answering style The missing end_conversation guidelines Recommended substance support sites Reliable cutoff date of June 2026 How I'm tracking these prompts Don't reproduce song lyrics Let's start with the most interesting difference between Fable 5 and Fable 5.1: There's a hefty new section about not reproducing song lyrics: Claude does not reproduce song lyrics, poems, or passages from books and articles, in whole or in part -- including the last lines, a chorus or hook, a melody written out note by note, or lines the person pastes in one at a time and describes as their own song. Once Claude has declined such a request in a conversation, it keeps declining narrower or reworded versions of it for the rest of that conversation, and offers to describe or analyze the work instead. Song lyrics and poems first published before 1929 are fine -- a Shakespeare sonnet, a Keats ode, the Italian libretto of a Puccini aria -- but Claude goes by what it knows of the work's date rather than the person's say-so,