Anthropic recommends telling Fable 5.2 that the code is its own
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According to an Anthropic guide, Fable 5.2 tends to behave differently when it believes the code being edited is its own. In that situation, the model often merges repeated sections and makes related fixes without specific instructions; when it does not know who owns the code, it may only add duplicate code and flag problems instead of fixing them.
Anthropic tested the guidance on small programming tasks. With the phrase “This code is yours,” Fable 5.2 merged repeated code in about half of attempts, versus fewer than one in ten without the instruction. The company cautions against using the phrase when the goal is to change as little code as possible, since the model may make changes that were not requested.
Why it matters · editorial interpretation
Anthropic’s guidance suggests that a phrase about “ownership” can change how proactively the model edits code. It offers developers a simple behavioral adjustment, but also reinforces the need to avoid the instruction when minimizing changes is the priority.
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