Can LLM-as-a-Judge Reliably Verify Rubrics in Agentic Scenarios?

Yangda Peng, Yunjia Qi, Haotian Xia, Guanzhong He, Xintong Shi, Richeng Xuan, Songyuanyi Lu, Yixian Liu, Zhichao Hu, Lliu Yuhong, Hao Peng


Abstract
Rubric-based scoring has become a widely used paradigm in model evaluation, typically with LLM-as-a-Judge (LaaJ) for rubric scoring. However, the reliability of LaaJ for rubric scoring remains underexplored. This concern is especially pronounced in agentic scenarios, where long, complex outputs further challenge reliable scoring. To address this, we conduct a systematic meta-evaluation of LaaJ reliability for rubric verification. We introduce RuVerBench, the first benchmark for assessing LaaJ reliability in rubric verification for agentic scenarios. RuVerBench covers two prevalent agentic domains, deep research and agentic coding, with 2,458 instances, each containing a model-generated output, a rubric, and a human-annotated label indicating whether the output satisfies the rubric. Using RuVerBench, we evaluate numerous frontier LLMs and find that even the most advanced models achieve strong performance but still exhibit substantial noise. We further analyze the impact of key LaaJ strategies, including prompt design, batching, and majority voting, on rubric verification. We find that weaker models are more sensitive to prompt variations, batched verification presents a trade-off between accuracy and efficiency, and majority voting yields effective but diminishing returns. We have released our dataset and code to facilitate future research: https://github.com/THU-KEG/RuVerBench.
Anthology ID:
2026.emnlp-main.2192
Volume:
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
49833–49851
Language:
URL:
https://aclanthology.org/2026.emnlp-main.2192/
DOI:
Bibkey:
Cite (ACL):
Yangda Peng, Yunjia Qi, Haotian Xia, Guanzhong He, Xintong Shi, Richeng Xuan, Songyuanyi Lu, Yixian Liu, Zhichao Hu, Lliu Yuhong, and Hao Peng. 2026. Can LLM-as-a-Judge Reliably Verify Rubrics in Agentic Scenarios?. In Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing, pages 49833–49851, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
Can LLM-as-a-Judge Reliably Verify Rubrics in Agentic Scenarios? (Peng et al., EMNLP 2026)
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PDF:
https://aclanthology.org/2026.emnlp-main.2192.pdf