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Large language models (LLMs) are widely used as scalable evaluators of model responses in lieu of human annotators. However, imperfect sensitivity and specificity of the LLM judges induce bias in naive evaluation scores. We propose a simple…

Machine Learning · Computer Science 2026-02-10 Chungpa Lee , Thomas Zeng , Jongwon Jeong , Jy-yong Sohn , Kangwook Lee

LLM-as-a-Judge has emerged as a popular evaluation strategy, where advanced large language models assess generation results in alignment with human instructions. While these models serve as a promising alternative to human annotators, their…

Computation and Language · Computer Science 2025-05-20 Xiyan Fu , Wei Liu

Traditional reference-based metrics, such as BLEU and ROUGE, are less effective for assessing outputs from Large Language Models (LLMs) that produce highly creative or superior-quality text, or in situations where reference outputs are…

Human-Computer Interaction · Computer Science 2024-07-08 Qian Pan , Zahra Ashktorab , Michael Desmond , Martin Santillan Cooper , James Johnson , Rahul Nair , Elizabeth Daly , Werner Geyer

LLM-as-a-Judge has been widely applied to evaluate and compare different LLM alignmnet approaches (e.g., RLHF and DPO). However, concerns regarding its reliability have emerged, due to LLM judges' biases and inconsistent decision-making.…

Computation and Language · Computer Science 2025-04-01 Hui Wei , Shenghua He , Tian Xia , Fei Liu , Andy Wong , Jingyang Lin , Mei Han

The "LLM-as-a-Judge" paradigm, using Large Language Models (LLMs) as automated evaluators, is pivotal to LLM development, offering scalable feedback for complex tasks. However, the reliability of these judges is compromised by various…

Computation and Language · Computer Science 2026-05-22 Qingquan Li , Shaoyu Dou , Kailai Shao , Chao Chen , Haixiang Hu

Large Language Models (LLMs) have demonstrated impressive performance in biomedical relation extraction, even in zero-shot scenarios. However, evaluating LLMs in this task remains challenging due to their ability to generate human-like…

Computation and Language · Computer Science 2025-06-03 Md Tahmid Rahman Laskar , Israt Jahan , Elham Dolatabadi , Chun Peng , Enamul Hoque , Jimmy Huang

There is an increasing trend towards evaluating NLP models with LLMs instead of human judgments, raising questions about the validity of these evaluations, as well as their reproducibility in the case of proprietary models. We provide…

The potential of using Large Language Models (LLMs) themselves to evaluate LLM outputs offers a promising method for assessing model performance across various contexts. Previous research indicates that LLM-as-a-judge exhibits a strong…

Human-Computer Interaction · Computer Science 2024-10-29 Annalisa Szymanski , Noah Ziems , Heather A. Eicher-Miller , Toby Jia-Jun Li , Meng Jiang , Ronald A. Metoyer

LLM-as-a-Judge has been widely adopted as an evaluation method and served as supervised rewards in model training. However, existing benchmarks for LLM-as-a-Judge are mainly relying on human-annotated ground truth, which introduces human…

Computation and Language · Computer Science 2025-12-19 Yuanning Feng , Sinan Wang , Zhengxiang Cheng , Yao Wan , Dongping Chen

New Large Language Models (LLMs) become available every few weeks, and modern application developers confronted with the unenviable task of having to decide if they should switch to a new model. While human evaluation remains the gold…

Artificial Intelligence · Computer Science 2025-12-25 Suryaansh Jain , Umair Z. Ahmed , Shubham Sahai , Ben Leong

Large language models (LLMs) are being widely applied across various fields, but as tasks become more complex, evaluating their responses is increasingly challenging. Compared to human evaluators, the use of LLMs to support performance…

Artificial Intelligence · Computer Science 2025-04-25 Yuran Li , Jama Hussein Mohamud , Chongren Sun , Di Wu , Benoit Boulet

As large language models (LLMs) grow in capability and autonomy, evaluating their outputs-especially in open-ended and complex tasks-has become a critical bottleneck. A new paradigm is emerging: using AI agents as the evaluators themselves.…

Artificial Intelligence · Computer Science 2025-08-06 Fangyi Yu

LLM-as-a-Judge has been widely utilized as an evaluation method in various benchmarks and served as supervised rewards in model training. However, despite their excellence in many domains, potential issues are under-explored, undermining…

Computation and Language · Computer Science 2024-10-07 Jiayi Ye , Yanbo Wang , Yue Huang , Dongping Chen , Qihui Zhang , Nuno Moniz , Tian Gao , Werner Geyer , Chao Huang , Pin-Yu Chen , Nitesh V Chawla , Xiangliang Zhang

LLM-as-a-Judge and reward models are widely used alternatives of multiple-choice questions or human annotators for large language model (LLM) evaluation. Their efficacy shines in evaluating long-form responses, serving a critical role as…

Computation and Language · Computer Science 2024-10-03 Guijin Son , Hyunwoo Ko , Hoyoung Lee , Yewon Kim , Seunghyeok Hong

Reliable evaluation of large language models (LLMs) is critical as their deployment rapidly expands, particularly in high-stakes domains such as business and finance. The LLM-as-a-Judge framework, which uses prompted LLMs to evaluate…

Computation and Language · Computer Science 2026-04-03 Michael Krumdick , Charles Lovering , Varshini Reddy , Seth Ebner , Chris Tanner

Large language models (LLMs) can serve as judges that offer rapid and reliable assessments of other LLM outputs. However, models may systematically assign overly favorable ratings to their own outputs, a phenomenon known as self-bias, which…

Computation and Language · Computer Science 2025-08-12 Evangelia Spiliopoulou , Riccardo Fogliato , Hanna Burnsky , Tamer Soliman , Jie Ma , Graham Horwood , Miguel Ballesteros

Assessment and evaluation have long been critical challenges in artificial intelligence (AI) and natural language processing (NLP). Traditional methods, usually matching-based or small model-based, often fall short in open-ended and dynamic…

Evaluating recommender systems remains a long-standing challenge, as offline methods based on historical user interactions and train-test splits often yield unstable and inconsistent results due to exposure bias, popularity bias, sampled…

LLM-as-a-judge is a framework where a large language model (LLM) evaluates the output of another LLM. While LLMs excel at producing qualitative textual evaluations, they often struggle to predict human preferences and numeric scores. We…

LLM-based judges have emerged as a scalable alternative to human evaluation and are increasingly used to assess, compare, and improve models. However, the reliability of LLM-based judges themselves is rarely scrutinized. As LLMs become more…

Artificial Intelligence · Computer Science 2025-04-08 Sijun Tan , Siyuan Zhuang , Kyle Montgomery , William Y. Tang , Alejandro Cuadron , Chenguang Wang , Raluca Ada Popa , Ion Stoica