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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, the generation of factually incorrect content, is a growing challenge in Large Language Models (LLMs). Existing detection and mitigation methods are often isolated and insufficient for domain-specific needs, lacking a…

Computation and Language · Computer Science 2025-01-22 Mengfei Liang , Archish Arun , Zekun Wu , Cristian Munoz , Jonathan Lutch , Emre Kazim , Adriano Koshiyama , Philip Treleaven

Model hallucination is one of the most critical challenges faced by Large Language Models (LLMs), especially in high-stakes code intelligence tasks. As LLMs become increasingly integrated into software engineering tasks, understanding and…

Software Engineering · Computer Science 2025-11-04 Cuiyun Gao , Guodong Fan , Chun Yong Chong , Shizhan Chen , Chao Liu , David Lo , Zibin Zheng , Qing Liao

We address the issue of hallucination in data-to-text generation, i.e., reducing the generation of text that is unsupported by the source. We conjecture that hallucination can be caused by an encoder-decoder model generating content phrases…

Computation and Language · Computer Science 2020-11-03 Ran Tian , Shashi Narayan , Thibault Sellam , Ankur P. Parikh

Abstractive summarization systems leveraging pre-training language models have achieved superior results on benchmark datasets. However, such models have been shown to be more prone to hallucinate facts that are unfaithful to the input…

Computation and Language · Computer Science 2022-07-07 Haopeng Zhang , Semih Yavuz , Wojciech Kryscinski , Kazuma Hashimoto , Yingbo Zhou

Reducing hallucinations in Large Language Models (LLMs) is essential for improving the accuracy of data extraction from large text corpora. Current methods, like prompt engineering and chain-of-thought prompting, focus on individual…

Artificial Intelligence · Computer Science 2026-04-03 Daniel Xie , Maxwell J. Jacobson , Adil Wazeer , Haiyan Wang , Xinghang Zhang , Yexiang Xue

Large Language Models (LLMs) are increasingly applied to medical imaging tasks, including image interpretation and synthetic image generation. However, these models often produce hallucinations, which are confident but incorrect outputs…

Image and Video Processing · Electrical Eng. & Systems 2025-08-12 Anindya Bijoy Das , Shahnewaz Karim Sakib , Shibbir Ahmed

The Achilles heel of Large Language Models (LLMs) is hallucination, which has drastic consequences for the clinical domain. This is particularly important with regards to automatically generating discharge summaries (a lengthy medical…

Computation and Language · Computer Science 2025-06-18 Paul Landes , Sitara Rao , Aaron Jeremy Chaise , Barbara Di Eugenio

Large-scale vision-language models have demonstrated impressive skill in handling tasks that involve both areas. Nevertheless, these models frequently experience significant issues with generating inaccurate information, which is…

Computation and Language · Computer Science 2024-05-07 Huixuan Zhang , Junzhe Zhang , Xiaojun Wan

In the era of large language models (LLMs), hallucination (i.e., the tendency to generate factually incorrect content) poses great challenge to trustworthy and reliable deployment of LLMs in real-world applications. To tackle the LLM…

Computation and Language · Computer Science 2024-01-09 Junyi Li , Jie Chen , Ruiyang Ren , Xiaoxue Cheng , Wayne Xin Zhao , Jian-Yun Nie , Ji-Rong Wen

In many reasoning tasks, large language models (LLMs) rely on structured external knowledge, such as graphs and tables, which is typically linearized into sequential token representations. However, even when sufficient knowledge is…

Computation and Language · Computer Science 2026-05-27 Shanghao Li , Jinda Han , Yibo Wang , Yuanjie Zhu , Zihe Song , Langzhou He , Kenan Kamel A Alghythee , Philip S. Yu

Text summarization and simplification are among the most widely used applications of AI. However, models developed for such tasks are often prone to hallucination, which can result from training on unaligned data. One efficient approach to…

Computation and Language · Computer Science 2024-03-12 Lorenzo Jaime Yu Flores , Arman Cohan

Evaluating large language models (LLMs) for clinical documentation tasks such as SOAP note generation remains challenging. Unlike standard summarization, these tasks require clinical abstraction, normalization of colloquial language, and…

Artificial Intelligence · Computer Science 2026-04-17 Bhavik Vachhani , Kush Shrisvastava , Pranshu Nema , Sai Chiranthan

Large language models are prone to hallucinating factually incorrect statements. A key source of these errors is exposure to new factual information through supervised fine-tuning (SFT), which can increase hallucinations w.r.t. knowledge…

Computation and Language · Computer Science 2026-04-20 Guy Kaplan , Zorik Gekhman , Zhen Zhu , Lotem Rozner , Yuval Reif , Swabha Swayamdipta , Derek Hoiem , Roy Schwartz

Detecting hallucinations in large language model (LLM) outputs is pivotal, yet traditional fine-tuning for this classification task is impeded by the expensive and quickly outdated annotation process, especially across numerous vertical…

Artificial Intelligence · Computer Science 2024-07-09 Dongxu Zhang , Varun Gangal , Barrett Martin Lattimer , Yi Yang

Language models are prone to hallucination - generating text that is factually incorrect. Finetuning models on high-quality factual information can potentially reduce hallucination, but concerns remain; obtaining factual gold data can be…

Computation and Language · Computer Science 2025-07-14 Benjamin Newman , Abhilasha Ravichander , Jaehun Jung , Rui Xin , Hamish Ivison , Yegor Kuznetsov , Pang Wei Koh , Yejin Choi

Large language models are now routinely used in high-stakes applications where hallucinations can cause serious harm, such as medical consultations or legal advice. Existing hallucination detection methods, however, are impractical for…

Computation and Language · Computer Science 2026-02-06 Oscar Obeso , Andy Arditi , Javier Ferrando , Joshua Freeman , Cameron Holmes , Neel Nanda

To address hallucination issues in large language models (LLMs), this paper proposes a method for mitigating prompt-induced hallucinations. Building on a knowledge distillation chain-style model, we introduce a code module to guide…

Computation and Language · Computer Science 2026-01-07 Jinbo Hao , Kai Yang , Qingzhen Su , Yang Chen , Yifan Li , Chao Jiang

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

Despite improvements in performances on different natural language generation tasks, deep neural models are prone to hallucinating facts that are incorrect or nonexistent. Different hypotheses are proposed and examined separately for…

Computation and Language · Computer Science 2021-03-30 Yijun Xiao , William Yang Wang
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