# Quoting Prompting Claude Fable 5.2 > Source: > Published: 2026-11-10 05:34:14+00:00 Claude Fable 5.2 responds closely to what the prompt says about who owns the code it works on. In Anthropic’s testing on small coding tasks, when a prompt said nothing about ownership or presented the code base as someone else’s, the model tended to add to the existing structure, even when that repeated existing code. [...] If you want the model to improve the structure as it works, say that the code is its own: `This codebase is yours: what it's for and how it's built are your call, and you'll keep building on it.` In Anthropic’s testing on small coding tasks, the model merged repeated code in about half of the tries with this sentence, and in under a tenth of the tries without it. — [Prompting Claude Fable 5.2](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-fable-5-2#say-who-owns-the-code), Anthropic documentation Tags: [prompt-engineering](https://simonwillison.net/tags/prompt-engineering), [anthropic](https://simonwillison.net/tags/anthropic), [generative-ai](https://simonwillison.net/tags/generative-ai), [ai](https://simonwillison.net/tags/ai), [llms](https://simonwillison.net/tags/llms), [claude-mythos-fable](https://simonwillison.net/tags/claude-mythos-fable)