Quoting Prompting Claude Fable 5.2

Anthropic documentation notes that Claude Fable 5.2 responds closely to what a prompt says about who owns the code it works on. In Anthropic's testing on small coding tasks, the model tended to add to existing structure when a prompt said nothing about ownership or presented the codebase as someone else's, even when that repeated existing code; telling the model the codebase is its own led it to merge repeated code in about half of tries, versus under a tenth without that sentence.