Diff-XYZ: A Benchmark for Evaluating Diff Understanding

Diff-XYZ: A simple test for understanding code changes

Diff-XYZ is a small, clear test that checks how well tools understand code changes, and it matters a lot.
It shows three tasks that let a tool apply edits, undo them, or make the short note that explains a change, the tasks are simple to imagine.
This setup helps teams see when a tool can do the job, or when it needs work, so teams save time and frustration.
The people who built it tried different ways to write those change notes and found that format matters depending on model size.
For instance, one style works well with big models but stumbles on smaller ones, that difference is useful to know.
Diff-XYZ uses real edits from everyday projects, so it feels close to real work and not some toy test and that is why its helpful.
Think of it as a shared test-base to measure and improve tools that edit code, to make them faster and safer.
If you care about smarter coding tools, Diff-XYZ gives a clear path to compare, learn and get better fast.

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Diff-XYZ: A Benchmark for Evaluating Diff Understanding

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