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Test set contamination, wherein test data from a benchmark ends up in a newer model's training set, is a well-documented obstacle for fair LLM evaluation and can quickly render benchmarks obsolete. To mitigate this, many recent benchmarks…

The increasing complexity of large language models (LLMs) raises concerns about their ability to "cheat" on standard Question Answering (QA) benchmarks by memorizing task-specific data. This undermines the validity of benchmark evaluations,…

Computation and Language · Computer Science 2025-09-16 Yixiong Fang , Tianran Sun , Yuling Shi , Min Wang , Xiaodong Gu

The opacity in developing large language models (LLMs) is raising growing concerns about the potential contamination of public benchmarks in the pre-training data. Existing contamination detection methods are typically based on the text…

Computation and Language · Computer Science 2024-10-31 Feng Yao , Yufan Zhuang , Zihao Sun , Sunan Xu , Animesh Kumar , Jingbo Shang

Publishing a large language model (LLM) benchmark on the Internet risks contaminating future LLMs: the benchmark may be unintentionally (or intentionally) used to train or select a model. A common mitigation is to keep the benchmark private…

Machine Learning · Computer Science 2025-10-07 Takashi Ishida , Thanawat Lodkaew , Ikko Yamane

Benchmark-based evaluation is the de facto standard for comparing large language models (LLMs). However, its reliability is increasingly threatened by test set contamination, where test samples or their close variants leak into training…

Computation and Language · Computer Science 2026-01-28 Jianzhe Chai , Yu Zhe , Jun Sakuma

Data contamination has received increasing attention in the era of large language models (LLMs) due to their reliance on vast Internet-derived training corpora. To mitigate the risk of potential data contamination, LLM benchmarking has…

Machine Learning · Computer Science 2025-10-01 Simin Chen , Yiming Chen , Zexin Li , Yifan Jiang , Zhongwei Wan , Yixin He , Dezhi Ran , Tianle Gu , Haizhou Li , Tao Xie , Baishakhi Ray

Recent advancements in Large Language Models (LLMs) have demonstrated significant progress in various areas, such as text generation and code synthesis. However, the reliability of performance evaluation has come under scrutiny due to data…

Computation and Language · Computer Science 2025-06-06 Yuxing Cheng , Yi Chang , Yuan Wu

The problem of data contamination is now almost inevitable during the development of large language models (LLMs), with the training data commonly integrating those evaluation benchmarks even unintentionally. This problem subsequently makes…

Computation and Language · Computer Science 2025-09-19 Ruijie Hou , Yueyang Jiao , Hanxu Hu , Yingming Li , Wai Lam , Huajian Zhang , Hongyuan Lu

Recent observations have underscored a disparity between the inflated benchmark scores and the actual performance of LLMs, raising concerns about potential contamination of evaluation benchmarks. This issue is especially critical for…

Computation and Language · Computer Science 2024-04-05 Chunyuan Deng , Yilun Zhao , Xiangru Tang , Mark Gerstein , Arman Cohan

Benchmark datasets are critical for reproducible, reliable, and discriminative evaluation of LLMs. However, recent studies reveal that many benchmark datasets are included in pretraining corpora, i.e., $\textit{contaminated}$, which…

Machine Learning · Computer Science 2026-05-20 Ali Al-Lawati , Jason Lucas , Dongwon Lee , Suhang Wang

The expanding integration of Large Language Models (LLMs) into recommender systems poses critical challenges to evaluation reliability. This paper identifies and investigates a previously overlooked issue: benchmark data leakage in…

Machine Learning · Computer Science 2026-05-27 Mingqiao Zhang , Qiyao Peng , Yinghui Wang , Hongtao Liu , Yumeng Wang

Large Language Models (LLMs) are widely utilized in software engineering (SE) tasks, such as code generation and automated program repair. However, their reliance on extensive and often undisclosed pre-training datasets raises significant…

Software Engineering · Computer Science 2025-02-11 Xin Zhou , Martin Weyssow , Ratnadira Widyasari , Ting Zhang , Junda He , Yunbo Lyu , Jianming Chang , Beiqi Zhang , Dan Huang , David Lo

Benchmarking is the de-facto standard for evaluating LLMs, due to its speed, replicability and low cost. However, recent work has pointed out that the majority of the open source benchmarks available today have been contaminated or leaked…

Cryptography and Security · Computer Science 2024-06-25 Tanmay Rajore , Nishanth Chandran , Sunayana Sitaram , Divya Gupta , Rahul Sharma , Kashish Mittal , Manohar Swaminathan

In this position paper, we argue that the classical evaluation on Natural Language Processing (NLP) tasks using annotated benchmarks is in trouble. The worst kind of data contamination happens when a Large Language Model (LLM) is trained on…

Computation and Language · Computer Science 2023-10-30 Oscar Sainz , Jon Ander Campos , Iker García-Ferrero , Julen Etxaniz , Oier Lopez de Lacalle , Eneko Agirre

Large language models (LLMs) have achieved impressive performance across various natural language benchmarks, prompting a continual need to curate more difficult datasets for larger LLMs, which is costly and time-consuming. In this paper,…

Computation and Language · Computer Science 2024-06-07 Jiahao Ying , Yixin Cao , Yushi Bai , Qianru Sun , Bo Wang , Wei Tang , Zhaojun Ding , Yizhe Yang , Xuanjing Huang , Shuicheng Yan

The deployment of Large Language Models (LLMs) in high-stakes clinical settings demands rigorous and reliable evaluation. However, existing medical benchmarks remain static, suffering from two critical limitations: (1) data contamination,…

Artificial Intelligence · Computer Science 2026-02-12 Zhiling Yan , Dingjie Song , Zhe Fang , Yisheng Ji , Xiang Li , Quanzheng Li , Lichao Sun

The success of Large Language Models (LLMs) relies heavily on the huge amount of pre-training data learned in the pre-training phase. The opacity of the pre-training process and the training data causes the results of many benchmark tests…

Computation and Language · Computer Science 2025-03-03 Shiwen Ni , Xiangtao Kong , Chengming Li , Xiping Hu , Ruifeng Xu , Jia Zhu , Min Yang

In machine learning, contamination refers to situations where testing data leak into the training set. The issue is particularly relevant for the evaluation of the performance of Large Language Models (LLMs), which are generally trained on…

Computation and Language · Computer Science 2025-06-23 Nicolas Yax , Pierre-Yves Oudeyer , Stefano Palminteri

Large language models (LLMs) have shown potential in assisting scientific research, yet their ability to discover high-quality research hypotheses remains unexamined due to the lack of a dedicated benchmark. To address this gap, we…

Computation and Language · Computer Science 2026-04-21 Yujie Liu , Zonglin Yang , Tong Xie , Jinjie Ni , Ben Gao , Yuqiang Li , Shixiang Tang , Wanli Ouyang , Erik Cambria , Dongzhan Zhou

Benchmark contamination poses a significant challenge to the reliability of Large Language Models (LLMs) evaluations, as it is difficult to assert whether a model has been trained on a test set. We introduce a solution to this problem by…

Cryptography and Security · Computer Science 2025-07-22 Tom Sander , Pierre Fernandez , Saeed Mahloujifar , Alain Durmus , Chuan Guo
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