arXiv cs.CLPaper
PreciseCoder: Faithful and Generalizable Debugging Beyond Unit-Test Rewards
Unit-test-only rewards teach models to edit promiscuously and hallucinate bugs in correct code. This is the first credible fix: adding a signal for precise, verified edits. The numbers are concrete (3 vs 7-15 lines per fix) and the generalization from toy problems to repo-level repair is exactly what matters for real codebases. If you're building code-fixing infrastructure, this changes your training recipe.