JudgeBench: A Benchmark for Evaluating LLM-based Judges
Paper · 2024 · Sijun Tan, Siyuan Zhuang, Kyle Montgomery et al.
Summary
LLM-based judges are now widely used to rank models, act as reward models, and pick the best candidate answers, yet their own reliability is seldom tested. Existing judge benchmarks mostly measure agreement with crowdsourced human preferences. On hard problems, those preferences are a weak signal of whether an answer is actually correct, because annotators tend to reward plausibility or length. The authors propose a hierarchy of criteria: instruction following first, then factual and logical correctness, and only then style. Using this hierarchy, they build JudgeBench with a pipeline that turns any dataset with ground-truth answers and a verification procedure into pairs of responses. A strong model such as GPT-4o generates several answers per question. These are graded against the ground truth, and each pair keeps one correct answer and one subtly wrong answer. The authors tested prompted, fine-tuned, multi-agent judges and reward models. JudgeBench proved much harder than earlier benchmarks, with strong systems like GPT-4o scoring only slightly above chance. This makes it a demanding testbed for judges that rely on reasoning.
Key points
- The dataset's 350 response pairs cover four domains (coding, mathematics, reasoning, and general knowledge), and in every pair one response is objectively right while the other is objectively wrong.
- The evaluation framework ranks criteria in order. A response must first follow instructions, then be factually and logically sound. Stylistic alignment matters only when both earlier conditions hold.
- The pipeline is general. It works with any source dataset that has ground-truth labels. Candidate answers are sampled from a strong LLM, and judges are queried with the two responses presented in both orders.
- Four families of evaluators were compared: prompted judges, fine-tuned judges (e.g., Auto-J, Skywork-style prompts), multi-agent judges (e.g., ChatEval), and reward models. Many strong models were close to random guessing.
- Data and code are released at github.com/ScalerLab/JudgeBench (arXiv:2410.12784, UC Berkeley and Washington University in St. Louis).
Institutions
Fields, topics and concepts
📚 Shelves 5The field of science this work belongs to (OpenAlex fields).Computer Science · 18,614 worksArtificial Intelligence · 17,965 worksArts and Humanities · 17,450 worksLanguage and Linguistics · 17,296 worksInformation Systems · 1,730 works
🧭 Topics 1Research subjects and languages the work is about.Evaluation & benchmarks · 1,341 works
Cite
Cite as Sijun Tan, Siyuan Zhuang, Kyle Montgomery, William Y. Tang, Alejandro Cuadron, Chenguang Wang, Raluca Ada Popa and Ion Stoica. 2024. JudgeBench: A Benchmark for Evaluating LLM-based Judges. arXiv:2410.12784.
@misc{tan2024judgebench,
title = {{JudgeBench: A Benchmark for Evaluating LLM-based Judges}},
author = {Sijun Tan, Siyuan Zhuang, Kyle Montgomery, William Y. Tang, Alejandro Cuadron, Chenguang Wang, Raluca Ada Popa and Ion Stoica},
year = {2024},
doi = {10.48550/arxiv.2410.12784},
eprint = {2410.12784},
archivePrefix = {arXiv},
url = {https://doi.org/10.48550/arxiv.2410.12784}
}References
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