Can LLMs Replace Human Evaluators? An Empirical Study of LLM-as-a-Judge in Software Engineering
Open accessAbstract
Recently, large language models (LLMs) have been deployed to tackle various software engineering (SE) tasks like code generation, significantly advancing the automation of SE tasks. However, assessing the quality of these LLM-generated code and text remains challenging. The commonly used Pass@ k metric necessitates extensive unit tests and configured environments, demands a high labor cost, and is not suitable for evaluating LLMgenerated text. Conventional metrics like BLEU, which measure only lexical rather than semantic similarity, have also come under scrutiny. In response, a new trend has emerged to employ LLMs for automated evaluation, known as LLM-as-a-judge. These LLM-as-a-judge methods are claimed to better mimic human assessment than conventional metrics without relying on high-quality reference answers. Nevertheless, their exact human alignment in SE tasks remains unexplored. In this paper, we empirically explore LLM-as-a-judge methods for evaluating SE tasks, focusing on their alignment with human judgments. We select seven LLM-as-a-judge methods that utilize general-purpose LLMs, alongside two LLMs specifically fine-tuned for evaluation. After generating and manually scoring LLM responses on three recent SE datasets of code translation, code generation, and code summarization, we then prompt these methods to evaluate each response. Finally, we compare the scores generated by these methods with human evaluation. The results indicate that output-based methods reach the highest Pearson correlation of 81.32 and 68.51 with human scores in code translation and generation, achieving near-human evaluation, noticeably outperforming ChrF++, one of the best conventional metrics, at 34.23 and 64.92. Such outputbased methods prompt LLMs to output judgments directly, and exhibit more balanced score distributions that resemble human score patterns. Finally, we provide insights and implications, concluding that current state-of-the-art LLM-as-a-judge methods can potentially replace human evaluations in certain SE tasks.
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The LLM-as-Judge evaluation strategy is widely adopted and has been demonstrated to align well with human preferences.
“This LLM-as-Judge evaluation strategy is widely adopted in both NLP and software engineering domains [35], [36], as it has been demonstrated to align well with human preferences and provides more nuanced evaluation compared to traditional metrics [37], [38].”
From LongCodeZip: Compress Long Context for Code Language Models (2025) · cites this paper as [37]
The Introduction describes LLM-as-a-judge as an emerging evaluation approach, but says its use in software-engineering tasks is potential rather than establishing that it is widely adopted in both domains. The Introduction and §5.1 report strong alignment with human scores for some methods and tasks, particularly code translation, while emphasizing that performance varies substantially by task. The unqualified claim that the strategy aligns well with human preferences overstates those findings. (LLM, conf=0.86)
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GenScore: Agent-Based Short-Answer Question Generation and Scoring in Software Engineering Courses
Duong, T. N. B., & Shar, L. K. (2025) · IEEE Access · doi:10.1109/access.2025.3647111 · Cited by 3 · see citing works
Banitaan, S., Daoud, M., Alquran, H., & Akour, M. A. (2026) · Information · doi:10.3390/info17010073 · Cited by 5 · see citing works
Scaling Assessment of Student Models with LLMs: Integrating Feedback into Practice
Sölch, M., & Krusche, S. (2026) · ACM/IEEE International Conference on Software Engineering: Companion Proceedings (ICSE-Companion) · doi:10.1145/3786580.3786985 · Cited by 3 · see citing works
Co-Reviewer: can AI review like a human? An agentic framework for LLM-human alignment in peer review
Bharti, P. K., Dalal, V., & Panchal, M. (2026) · Scientometrics · doi:10.1007/s11192-026-05557-6 · Cited by 2 · see citing works
Usage patterns of software product metrics in assessing developers’ output: A comprehensive study
Chen, W., Yu, H., Fan, G., Huang, Z., & Liang, Y. (2025) · Information and Software Technology · doi:10.1016/j.infsof.2025.107935 · Cited by 4 · see citing works
Self-citationMulti-dimensional Assessment of Crowdsourced Testing Reports via LLMs
Wang, Y., Zhao, Y., Yu, S., & Chen, Z. (2025) · IEEE/ACM International Conference on Automated Software Engineering (ASE) · doi:10.1109/ase63991.2025.00150 · Cited by 2 · see citing works
FURINA: A Multi-Agent Framework for Automated Patch Correctness Assessment
Li, Y., Ji, Y., Chen, X., Shen, Z., Ge, J., & Luo, B. (2026) · ACM Transactions on Software Engineering and Methodology · doi:10.1145/3811825 · Cited by 2 · see citing works
SWE-Pruner: Self-Adaptive Context Pruning for Coding Agents
Wang, Y., Shi, Y., Yang, M., Zhang, R., He, S., Lian, H., Chen, Y., Ye, S., Cai, K., & Gu, X. (2026) · arXiv · doi:10.48550/arxiv.2601.16746 · Cited by 2 · see citing works
“Following initial generation, we apply a rigorous quality control mechanism using Qwen3-Next-80B-A3B-Thinking as an LLM-as-a-Judge filter (Wang et al., 2025a; Liu et al., 2023b; Song et al., 2024; He et al., 2025).”
LongCodeZip: Compress Long Context for Code Language Models
Shi, Y., Qian, Y., Zhang, H., Shen, B., & Gu, X. (2025) · arXiv · Cited by 7 · see citing works
“This LLM-as-Judge evaluation strategy is widely adopted in both NLP and software engineering domains [35], [36], as it has been demonstrated to align well with human preferences and provides more nuanced evaluation compared to traditional metrics [37], [38].”
User Feedback-Driven Generative Models-Based Methodology for Service Construction
Fan, G., Chen, S., & Zhang, L. (2025) · IEEE Internet Computing · doi:10.1109/mic.2025.3548143 · Cited by 1 · see citing works
Self-citationQuerying Large Automotive Software Models: Agentic vs. Direct LLM Approaches
Mazur, L., Petrović, N., Miranda, J. P., Radermacher, A., Rasche, R., & Knoll, A. (2025) · International Generative AI and Computational Language Modelling Conference (GACLM) · doi:10.1109/gaclm67198.2025.11232128 · Cited by 1 · see citing works
Comprehend, Imitate, and then Update: Unleashing the Power of LLMs in Test Suite Evolution
Xu, T., Liu, J., Yao, Y., Li, C., Xu, F., & Ma, X. (2025) · IEEE/ACM International Conference on Automated Software Engineering (ASE) · doi:10.1109/ase63991.2025.00046 · Cited by 1 · see citing works
Towards Function-Level Correctness Assessment of System Software with LLMs: A Case Study
Zhong, M., & Sun, X. (2025) · Asia-Pacific Software Engineering Conference (APSEC) · doi:10.1109/apsec66846.2025.00088 · Cited by 1 · see citing works
Who Does What? Archetypes of Roles Assigned to LLMs During Human-AI Decision-Making
Chappidi, S., Singh, J. P., & Krauze, A. V. (2026) · CHI Conference on Human Factors in Computing Systems · doi:10.1145/3772318.3791428 · Cited by 2 · see citing works
LLM-Assisted INVEST Evaluation and Improvement of User Stories: An Industrial Replication Study
Hernández–Agüero, E., Quesada–López, C., & Chaves-Sánchez, J. P. (2026) · Congresso Ibero-Americano em Engenharia de Software (CIbSE) · doi:10.5753/cibse.2026.42437 · Cited by 1 · see citing works
Yu, L., Zhang, J., Wang, X., Yang, L., Zhang, F., Wang, P., Xu, J. Q., & Ma, J. (2026) · Proceedings of the ACM on software engineering. · doi:10.1145/3808102 · Cited by 1 · see citing works
RAG Evaluation: From Model-Centric Benchmarks to System-Level Metrics
de Waal, A., van Niekerk, D. R., Donhauser, F., Suliman, S., & Lamprecht, D. (2025) · Communications in computer and information science · doi:10.1007/978-3-032-11733-5_26
Evaluating Generative AI Models for Code Generation Tasks Using Embedding-Based Semantic Similarity
Palla, D., & Krejcar, O. (2025) · International Conference on Control, Decision and Information Technologies (CoDIT) · doi:10.1109/codit66093.2025.11321666
An Agent-based Evaluation Framework for Complex Code Generation
Wang, X., Hu, R., Gao, P., Peng, C., & Gao, C. (2025) · IEEE/ACM International Conference on Automated Software Engineering (ASE) · doi:10.1109/ase63991.2025.00200 · Cited by 4 · see citing works
Self-citationMaciel, R. A. D. M., Carvalho, A. A. A., Pinheiro, M. L. P., & Nunes, S. M. L. (2025) · International Symposium on Computers in Education · doi:10.1109/siie68580.2025.11368402
Vu, T. T., Bui, T.-D., Nguyen, T.-T., Nguyen, S., & Vo, H. D. (2026) · Journal of Systems and Software · doi:10.1016/j.jss.2026.112852
Open-ended Structured Question Assessment with Human-LLM Collaboration
Lin, F., Lin, Y., Cao, K., Deng, Z., & Cai, Y. (2026) · CHI Conference on Human Factors in Computing Systems · doi:10.1145/3772318.3791034
Gui, X., Xia, D., Colley, M., Li, Y., Chauhan, V., Anubhav, A., Zhou, Z., Javanmardi, E., Seo, S. H., Chang, C.-M., et al. (2026) · CHI Conference on Human Factors in Computing Systems · doi:10.1145/3772318.3790537
LLM-as-a-Judge for mental support: A meta-evaluation using domain-specific platform data
Li, Y., Chen, X., & Dolata, M. (2026) · Electronic Markets · doi:10.1007/s12525-026-00890-3
Large Language Models as MT Evaluators: Statistical Evidence from a Low-Resource Setting
Munková, D., Munk, M., Chotar, M., & Hajek, P. (2026) · International Conference on Artificial Intelligence, Computer, Data Sciences and Applications (ACDSA) · doi:10.1109/acdsa67686.2026.11468166
ACREF: Enhancing Code Refinement Tasks for Large Language Models Using LLM-as-a-JudgePreprint
Mi, L., Xu, L., Liu, C., Mu, W., Li, Z., & Huangfu, L. (2026) · SSRN Electronic Journal · doi:10.2139/ssrn.6642016
Fonteles, J. H., Sivakumaran, N., Cohn, C., Coursey, A., Yu, S., Stengel-Eskin, E., Ashwin, T. S., Bansal, M., & Biswas, G. (2026) · International Conference on Learning Analytics and Knowledge (LAK) · doi:10.1145/3785022.3785109
More Than Human: The Capital-Market Effects of AI-Generated Corporate DisclosurePreprint
Chen, M. A., & Wang, J. (2025) · SSRN Electronic Journal · doi:10.2139/ssrn.5959496
Sabatucci, L., Cossentino, M., Napoli, C. D., & Susi, A. (2026) · Systems · doi:10.3390/systems14060598
Proxy Analysis in Bias Testing
Djennane, L., Kardkovács, Z. T., Benatallah, B., Gaci, Y., & Farah, Z. (2026) · Lecture notes in computer science · doi:10.1007/978-3-032-28117-3_15
Li, W., & Toxtli, C. (2026) · ACM Symposium on Applied Computing · doi:10.1145/3748522.3780008
Palla, D., Klímová, B., Pikhart, M., & Švejdarová, E. (2026) · Communications in computer and information science · doi:10.1007/978-981-92-0068-9_12
Park, C. M., Park, I. H., Kim, M., Jang, Y., Lim, H., & Hur, Y. (2026) · JCO Clinical Cancer Informatics · doi:10.1200/cci-25-00361
High Agreement, Shallow Reasoning: A Mixed-Method Study of LLMs in Refactoring Reviews
Amorim, L., Fortunato, C. B., Vale, G., & Figueiredo, E. (2026) · doi:10.1145/3803846.3807463
Mining Long Tail Bugs: Identifying Rare and Overlooked Issues in Code
Liang, W., Wu, Y., Ling, X., Luo, T., Liu, D., Zhang, H., & Wu, J. (2026) · Proceedings of the ACM on software engineering. · doi:10.1145/3797071
Validating LLM-Generated SQL Queries through Metamorphic Prompting
Lin, L. G., Zhu, Q., Hong, J., Wang, C., Liu, Y., & Wu, R. (2026) · Proceedings of the ACM on software engineering. · doi:10.1145/3797146
Large Language Models for UML Class Diagram Modeling: A Preliminary Empirical Evaluation
Cheng, Y., Huang, Y. R., Yao, S., Qian, Y., Zhang, L., Fang, X., & Wu, T. (2026) · Applied Sciences · doi:10.3390/app16136540
Falcão, F. D. S., & Canedo, E. D. (2026) · Empirical Software Engineering · doi:10.1007/s10664-026-10919-y
More than a Judge: An Empirical Study of Agent-Human Interaction in Crowdsourced Testing Assessment
Wang, Y., Zhao, Y., Yu, S., Chen, Z., & Gu, Q. (2026) · ACM Transactions on Software Engineering and Methodology · doi:10.1145/3828168
Reliable and Developer-Aligned Evaluation of Agents for Software Engineering
Popescu, R. M. (2026) · ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE) · doi:10.1145/3803437.3804877
Dependency-Guided Repository-Level C-to-Rust Translation with Reinforcement Alignment
Feng, J., Gan, W., Gao, C., Wang, C., Luo, F., Xia, X., Li, G., & Liu, K. (2026) · ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (ESEC/FSE) · doi:10.1145/3803437.3805266
Self-citationFramework-Adaptive Agentic Pipelines for API Knowledge Extraction and Test Generation
Zhao, P., Blake, J., & Pyshkin, E. (2026) · IEEE International Conference on Industry 4.0, Artificial Intelligence, and Communications Technology (IAICT) · doi:10.1109/iaict71158.2026.11620949
Decoupling Safety Assessment from Code Generation: Iterative Refinement with External SignalsPreprint
zhang, Z., & Feng, A. (2026) · SSRN Electronic Journal · doi:10.2139/ssrn.7203093
AutoLogger: A Multi-Agent Framework for the End-to-End Automated Logging
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Human-Verifiable API Documentation Generation for Legacy Web Frameworks Using Multi-Agent LLMs
Zhao, P., Blake, J., & Pyshkin, E. (2026) · Zooming Innovation in Consumer Technologies Conference (ZINC) · doi:10.1109/zinc69910.2026.11655803
Marco, G. D. (2026) · Structural Control and Health Monitoring · doi:10.1155/stc/8514242
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ACREF: LLM-as-a-Judge Guided Data Curation and Semantic Evaluation for Automated Code RefinementPreprint
Mi, L., Xu, L., Liu, C., Mu, W., Li, Z., & Huangfu, L. (2026) · SSRN Electronic Journal · doi:10.2139/ssrn.7346712
Agent-Based Ensemble Reasoning for Repository-Level Issue Resolution
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BinRAG: An RAG-Based Decompilation Framework Fusing Name Prediction and Calling Context
Wong, W. K., Wu, D., Liu, Z., Wang, H., Li, Z., & Wang, S. (2026) · Proceedings of the ACM on software engineering. · doi:10.1145/3832245
Paired Code Smells and Test Smells: A Fine-Grained Longitudinal Empirical Study
Cai, Z. (2026) · Proceedings of the ACM on software engineering. · doi:10.1145/3832264
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FAiLGen: Calibrating LLM for Failing Test Generation with Monte Carlo Tree Search
Li, T. O., Yan, X., DeHui, Y., Jiang, Y., Li, K., Xu, C., Wang, Y., & Cheung, S.-C. (2026) · IEEE/ACM International Conference on Automated Software Engineering (ASE) · doi:10.1145/3832783.3837478
Reconstructing Executable Programs from Informal Bug Reports
Ayon, R. S. (2026) · IEEE/ACM International Conference on Automated Software Engineering (ASE) · doi:10.1145/3832783.3844575
LLMs Cannot Reliably Judge (Yet?): A Comprehensive Assessment on the Robustness of LLM-as-a-Judge
Li, S., Xu, C., Wang, J., Gong, X., Chen, C., Zhang, J., Wang, J., Lam, K.-Y., & Ji, S. (2025) · arXiv · doi:10.48550/arxiv.2506.09443
“Beyond general text, the judge paradigm has been adapted to specialized domains, including software engineering [6], machine translation [25], legal reasoning [7], and mathematical problem solving [8].”
- Authors
- Wang, R., Guo, J., Gao, C., Fan, G., Chong, C. Y., & Xia, X.
- Affiliations
- Harbin Institute of Technology (CN)
- Monash University Malaysia (MY)
- Zhejiang University (CN)
- Venue
- Proceedings of the ACM on Software Engineering
- Published
- 2025-06-22
- Volume
- 2
- Issue
- ISSTA
- Pages
- 1955-1977
- ISSN
- 2994-970X (ISSN-L)
- OpenAlex
- W4411522868
- Cited by
- 62
- References
- 8
- Citations by year
- 2026: 44 · 2025: 18
- FWCI
- 65.00
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Proceedings of the ACM on software engineering. (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion, cc-by)
- arXiv (Cornell University) (cc-by)
- Funders
- National Natural Science Foundation of China (62472126)
- Natural Science Foundation of Guangdong Province (2023A1515011959)
- Topics
- Physical Sciences › Computer Science › Information Systems › Software Engineering Research
- Physical Sciences › Computer Science › Artificial Intelligence › Topic Modeling
- Physical Sciences › Computer Science › Artificial Intelligence › Natural Language Processing Techniques
- Keywords
- LLM-as-a-judge, large language models, automated assessment, human evaluation alignment, code generation evaluation, program translation, code summarization, human judgment correlation, BLEU, chrF, evaluation metrics
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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