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53.6K real edits to AI-generated code show what developers actually do, and how far models are from predicting it

AspireAI community · arXiv (Jenny Liang et al.)
AI-generated code gets edited, but nobody has measured how. DECODE collects 53.6K real-world in-IDE code edits of AI-generated code from more than 1K developers, and uses them for two things. First, to characterise the behaviour: developers put little effort into editing generated code and abandon it quickly, which argues for models that understand intent rather than chatty revisions. Second, to test whether LLMs can infer those edits. Predicting an edit turns out to be hard for both frontier and fine-tuned models. Frontier models produce edits that best reflect developer intent, but they tend to over-edit and to revert edits the developer wrote themselves; fine-tuning makes the predicted edits closer to the real ones and better reflects intent, yet does not close the gap to frontier models. The dataset is a realistic training and evaluation resource for developer-AI interaction research.
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