LLM Code Editing Suffers from Excessive Over-Editing
September 2, 2026
Evaluation across 400 BigCodeBench problems shows that frontier LLMs frequently rewrite code beyond the minimal necessary patch. Using preservation instructions can reduce average excess Levenshtein distance from 0.195 to 0.131.
HOW THIS AFFECTS YOU
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builderYou should include preservation instructions in your prompts to ensure LLM code edits remain minimal and reviewable.
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designerThis highlights the importance of maintaining code fidelity for human-in-the-loop code reviews.