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Factual hallucinations are a major challenge for Large Language Models (LLMs). They undermine reliability and user trust by generating inaccurate or fabricated content. Recent studies suggest that when generating false statements, the…

Computation and Language · Computer Science 2025-06-02 Giovanni Servedio , Alessandro De Bellis , Dario Di Palma , Vito Walter Anelli , Tommaso Di Noia

Hallucination is a key roadblock for applications of Large Language Models (LLMs), particularly for enterprise applications that are sensitive to information accuracy. To address this issue, two general approaches have been explored:…

Computation and Language · Computer Science 2024-10-15 Xinxi Chen , Li Wang , Wei Wu , Qi Tang , Yiyao Liu

While hallucinations of large language models (LLMs) prevail as a major challenge, existing evaluation benchmarks on factuality do not cover the diverse domains of knowledge that the real-world users of LLMs seek information about. To…

Large language models (LLMs) often fail to synthesize information from their context to generate an accurate response. This renders them unreliable in knowledge intensive settings where reliability of the output is key. A critical component…

Computation and Language · Computer Science 2024-11-06 Rajkumar Ramamurthy , Meghana Arakkal Rajeev , Oliver Molenschot , James Zou , Nazneen Rajani

Large language models (LLMs) have revolutionized natural language processing, yet their propensity for hallucination, generating plausible but factually incorrect or fabricated content, remains a critical challenge. This report provides a…

Computation and Language · Computer Science 2025-08-05 Manuel Cossio

While large language models (LLMs) have demonstrated remarkable capabilities across a range of downstream tasks, a significant concern revolves around their propensity to exhibit hallucinations: LLMs occasionally generate content that…

Computation and Language · Computer Science 2025-09-16 Yue Zhang , Yafu Li , Leyang Cui , Deng Cai , Lemao Liu , Tingchen Fu , Xinting Huang , Enbo Zhao , Yu Zhang , Chen Xu , Yulong Chen , Longyue Wang , Anh Tuan Luu , Wei Bi , Freda Shi , Shuming Shi

Hallucinations in generative AI, particularly in Large Language Models (LLMs), pose a significant challenge to the reliability of multilingual applications. Existing benchmarks for hallucination detection focus primarily on English and a…

Computation and Language · Computer Science 2025-03-28 Hanzhi Zhang , Sumera Anjum , Heng Fan , Weijian Zheng , Yan Huang , Yunhe Feng

Hallucination has been widely recognized to be a significant drawback for large language models (LLMs). There have been many works that attempt to reduce the extent of hallucination. These efforts have mostly been empirical so far, which…

Computation and Language · Computer Science 2025-02-14 Ziwei Xu , Sanjay Jain , Mohan Kankanhalli

Large language models (LLMs) often generate hallucinated content that lacks factual or contextual grounding, limiting their reliability in critical applications. Existing approaches such as supervised fine-tuning and reinforcement learning…

Computation and Language · Computer Science 2025-12-23 Jensen Zhang , Ningyuan Liu , Yijia Fan , Zihao Huang , Qinglin Zeng , Kaitong Cai , Jian Wang , Keze Wang

The tendency for hallucination in current large language models (LLMs) negatively impacts dialogue systems. Such hallucinations produce factually incorrect responses that may mislead users and undermine system trust. Existing refinement…

Computation and Language · Computer Science 2026-02-18 Xiangyan Chen , Yujian Gan , Matthew Purver

Hallucination, the generation of factually incorrect information, remains a significant challenge for large language models (LLMs), especially in open-domain long-form generation. Existing approaches for detecting hallucination in long-form…

Recent development of Large Vision-Language Models (LVLMs) has attracted growing attention within the AI landscape for its practical implementation potential. However, ``hallucination'', or more specifically, the misalignment between…

Computer Vision and Pattern Recognition · Computer Science 2024-05-07 Hanchao Liu , Wenyuan Xue , Yifei Chen , Dapeng Chen , Xiutian Zhao , Ke Wang , Liping Hou , Rongjun Li , Wei Peng

Concerns regarding the propensity of Large Language Models (LLMs) to produce inaccurate outputs, also known as hallucinations, have escalated. Detecting them is vital for ensuring the reliability of applications relying on LLM-generated…

Computation and Language · Computer Science 2024-05-31 Ernesto Quevedo , Jorge Yero , Rachel Koerner , Pablo Rivas , Tomas Cerny

Large Language Models (LLMs) are increasingly used for accessing information on the web. Their truthfulness and factuality are thus of great interest. To help users make the right decisions about the information they get, LLMs should not…

Computation and Language · Computer Science 2024-04-03 Chenglei Si , Navita Goyal , Sherry Tongshuang Wu , Chen Zhao , Shi Feng , Hal Daumé , Jordan Boyd-Graber

Despite their impressive capabilities, large language models (LLMs) are prone to hallucinations, i.e., generating content that deviates from facts seen during pretraining. We propose a simple decoding strategy for reducing hallucinations…

Computation and Language · Computer Science 2024-03-12 Yung-Sung Chuang , Yujia Xie , Hongyin Luo , Yoon Kim , James Glass , Pengcheng He

The detection of sophisticated hallucinations in Large Language Models (LLMs) is hampered by a ``Detection Dilemma'': methods probing internal states (Internal State Probing) excel at identifying factual inconsistencies but fail on logical…

Computation and Language · Computer Science 2026-01-09 Yusheng Song , Lirong Qiu , Xi Zhang , Zhihao Tang

Large language models (LLMs) are promising tools for supporting security management tasks, such as incident response planning. However, their unreliability and tendency to hallucinate remain significant challenges. In this paper, we address…

Artificial Intelligence · Computer Science 2026-02-06 Kim Hammar , Tansu Alpcan , Emil Lupu

Large language models (LLMs) are susceptible to generating inaccurate or false information, often referred to as "hallucinations" or "confabulations." While several technical advancements have been made to detect hallucinated content by…

Human-Computer Interaction · Computer Science 2025-08-12 Hyo Jin Do , Rachel Ostrand , Werner Geyer , Keerthiram Murugesan , Dennis Wei , Justin Weisz

The rapidly developing Large Vision Language Models (LVLMs) have shown notable capabilities on a range of multi-modal tasks, but still face the hallucination phenomena where the generated texts do not align with the given contexts,…

Computer Vision and Pattern Recognition · Computer Science 2025-01-07 Wenyi Xiao , Ziwei Huang , Leilei Gan , Wanggui He , Haoyuan Li , Zhelun Yu , Fangxun Shu , Hao Jiang , Linchao Zhu

Generation of plausible yet incorrect factual information, termed hallucination, is an unsolved issue in large language models. We study the ability of language models to deliberate on the responses they give in order to correct their…

Computation and Language · Computer Science 2023-09-26 Shehzaad Dhuliawala , Mojtaba Komeili , Jing Xu , Roberta Raileanu , Xian Li , Asli Celikyilmaz , Jason Weston