Quoting Prompting Claude Fable 5.2

Summary

Anthropic's documentation for Claude Fable 5.2 reports that, in its testing on small coding tasks, the model tended to extend existing code structure, even when that repeated code, unless the prompt framed the codebase as the model's own. Adding the sentence "This codebase is yours" led the model to merge repeated code in about half of the tries, compared with under a tenth without it.

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