Wang Bill Zhu

@billzhu.bsky.social

CS Ph.D. @ USC, https://billzhu.me

Frontier LLMs don't debug, they regenerate. We built PDB to measure that gap, GPT-5.1-Codex pass unit tests >76% of the time, but touch only <45% of the right lines. Even Claude Code touches only ~50%. 📄 Paper: arxiv.org/abs/2604.17338 🌐 Project: precise-debugging-benchmark.github.io

Precise Debugging Benchmark: Is Your Model Debugging or Regenerating?

Unlike code completion, debugging requires localizing faults and applying targeted edits. We observe that frontier LLMs often regenerate correct but over-edited solutions during debugging. To evaluate...

arxiv.org

✨ Excited to share our Chain-of-Questions paper #EMNLP2023: we develop a framework that trains *one T5 model* to robustly answer multistep questions by generating and answering sub-questions. Outperforms ChatGPT on DROP, HotpotQA and their contrast/adversarial sets.

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