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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

With the rise of Large Language Models (LLMs) in recent years, abundant new opportunities are emerging, but also new challenges, among which contamination is quickly becoming critical. Business applications and fundraising in Artificial…

Computation and Language · Computer Science 2025-07-11 Mathieu Ravaut , Bosheng Ding , Fangkai Jiao , Hailin Chen , Xingxuan Li , Ruochen Zhao , Chengwei Qin , Caiming Xiong , Shafiq Joty

Large language models~(LLMs) have greatly advanced the frontiers of artificial intelligence, attaining remarkable improvement in model capacity. To assess the model performance, a typical approach is to construct evaluation benchmarks for…

Computation and Language · Computer Science 2023-11-06 Kun Zhou , Yutao Zhu , Zhipeng Chen , Wentong Chen , Wayne Xin Zhao , Xu Chen , Yankai Lin , Ji-Rong Wen , Jiawei Han

The pursuit of leaderboard rankings in Large Language Models (LLMs) has created a fundamental paradox: models excel at standardized tests while failing to demonstrate genuine language understanding and adaptability. Our systematic analysis…

Computation and Language · Computer Science 2024-12-06 Sourav Banerjee , Ayushi Agarwal , Eishkaran Singh

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 rapid advancement of multimodal large language models (MLLMs) has significantly enhanced performance across benchmarks. However, data contamination-unintentional memorization of benchmark data during model training-poses critical…

Computer Vision and Pattern Recognition · Computer Science 2025-09-23 Dingjie Song , Sicheng Lai , Mingxuan Wang , Shunian Chen , Lichao Sun , Benyou Wang

We present Contamination Detection via Context (CoDeC), a practical and accurate method to detect and quantify training data contamination in large language models. CoDeC distinguishes between data memorized during training and data outside…

Computation and Language · Computer Science 2026-05-13 Michał Zawalski , Meriem Boubdir , Klaudia Bałazy , Besmira Nushi , Pablo Ribalta

With the rapid development of Large Language Models (LLMs), a large number of benchmarks have been proposed. However, most benchmarks lack unified evaluation standard and require the manual implementation of custom scripts, making results…

Post-cutoff performance decay of LLMs has been widely interpreted as a temporal signal for benchmark contamination, where public information released before the training cutoff may have been included into training corpora and inflated model…

The rapid development of Large Language Models (LLMs) like GPT-4, Claude-3, and Gemini has transformed the field of natural language processing. However, it has also resulted in a significant issue known as Benchmark Data Contamination…

Computation and Language · Computer Science 2024-06-07 Cheng Xu , Shuhao Guan , Derek Greene , M-Tahar Kechadi

Large language models (LLMs) are increasingly exposed to data contamination, i.e., performance gains driven by prior exposure of test datasets rather than generalization. However, in the context of tabular data, this problem is largely…

Computation and Language · Computer Science 2026-03-31 Matteo Silvestri , Fabiano Veglianti , Flavio Giorgi , Fabrizio Silvestri , Gabriele Tolomei

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

Benchmark data contamination has become a central challenge in LLM evaluation: when evaluation examples appear in the training data of one or more audited models, reported performance can be inflated and cross-model comparisons become…

Machine Learning · Computer Science 2026-05-22 Zhenlong Liu , Hao Zeng , Hongxin Wei

Leaderboards for LRMs have turned evaluation into a competition, incentivizing developers to optimize directly on benchmark suites. A shortcut to achieving higher rankings is to incorporate evaluation benchmarks into the training data,…

Cryptography and Security · Computer Science 2026-03-03 Han Wang , Haoyu Li , Brian Ko , Huan Zhang

Unlearning methods have the potential to improve the privacy and safety of large language models (LLMs) by removing sensitive or harmful information post hoc. The LLM unlearning research community has increasingly turned toward empirical…

Computation and Language · Computer Science 2025-04-09 Pratiksha Thaker , Shengyuan Hu , Neil Kale , Yash Maurya , Zhiwei Steven Wu , Virginia Smith

We are currently in an era of fierce competition among various large language models (LLMs) continuously pushing the boundaries of benchmark performance. However, genuinely assessing the capabilities of these LLMs has become a challenging…

Computation and Language · Computer Science 2024-06-04 Wenhong Zhu , Hongkun Hao , Zhiwei He , Yunze Song , Yumeng Zhang , Hanxu Hu , Yiran Wei , Rui Wang , Hongyuan Lu

Large language models (LLMs) are commonly evaluated on challenging benchmarks such as AIME and Math500, where benchmark contamination can make memorized solutions appear as genuine reasoning. Existing detection methods largely rely on…

Computation and Language · Computer Science 2026-05-12 Zirui He , Haiyan Zhao , Yingcong Li , Ali Payani , Mengnan du

Recent statements about the impressive capabilities of large language models (LLMs) are usually supported by evaluating on open-access benchmarks. Considering the vast size and wide-ranging sources of LLMs' training data, it could…

Computation and Language · Computer Science 2024-06-03 Yihong Dong , Xue Jiang , Huanyu Liu , Zhi Jin , Bin Gu , Mengfei Yang , Ge Li

Hampering the interpretation of benchmark scores, evaluation data contamination has become a growing concern in the evaluation of LLMs, and an active area of research studies its effects. While evaluation data contamination is easily…

Computation and Language · Computer Science 2024-11-07 Aaditya K. Singh , Muhammed Yusuf Kocyigit , Andrew Poulton , David Esiobu , Maria Lomeli , Gergely Szilvasy , Dieuwke Hupkes

Overestimation in evaluating large language models (LLMs) has become an increasing concern. Due to the contamination of public benchmarks or imbalanced model training, LLMs may achieve unreal evaluation results on public benchmarks, either…

Computation and Language · Computer Science 2026-05-26 Zi Liang , Liantong Yu , Shiyu Zhang , Qingqing Ye , Haibo Hu