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Evaluating the Effects of Prompt Perturbation on Bias and Hallucination in Large Language Models

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arXiv:2609.35804v1 Announce Type: new Abstract: Large language models (LLMs) have shown remarkable capabilities in various natural language processing tasks, leading to their widespread deployment as intelligent assistants in decision-making contexts. However, the increasing complexity of these models raises concerns about their reliability, particularly regarding bias and hallucination. In this work, we evaluate the robustness of LLMs to perturbed variations of the original inquiry in decision-making tasks. We show that contrary to previous studies, perturbations can mitigate bias and hallucination in some LLMs over other models. It's found that Claude 3 is more effective for the tasks represented in most datasets, whereas models like GPT3.5 exhibit varying levels of adequacy, performing…

SourcearXiv Computational LinguisticsAuthor: Mamehgol Yousefi, Ahmad Shahi, Mos Sharifi, Alvaro Romera, Simon Hoermann, Tham Piumsomboon
Evaluating the Effects of Prompt Perturbation on Bias and Hallucination in Large Language Models
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[Submitted on 18 Sep 2026]

Title:Evaluating the Effects of Prompt Perturbation on Bias and Hallucination in Large Language Models

View a PDF of the paper titled Evaluating the Effects of Prompt Perturbation on Bias and Hallucination in Large Language Models, by Mamehgol Yousefi and 5 other authors

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Abstract:Large language models (LLMs) have shown remarkable capabilities in various natural language processing tasks, leading to their widespread deployment as intelligent assistants in decision-making contexts. However, the increasing complexity of these models raises concerns about their reliability, particularly regarding bias and hallucination. In this work, we evaluate the robustness of LLMs to perturbed variations of the original inquiry in decision-making tasks. We show that contrary to previous studies, perturbations can mitigate bias and hallucination in some LLMs over other models. It's found that Claude 3 is more effective for the tasks represented in most datasets, whereas models like GPT3.5 exhibit varying levels of adequacy, performing comparably in some cases but falling significantly behind in others. These insights are crucial for understanding the practical implications of deploying LLM-based assistants as effective decision-support tools in real-world applications, emphasising the need for rigorous testing and validation to ensure reliability and effectiveness. This study contributes to the growing body of research on LLM evaluation and provides insights for developing more robust and trustworthy AI assistants in critical decision-making contexts.

Comments: 14 pages. Published in ICONIP 2024 (Neural Information Processing), LNCS 15290, Springer Nature, 2025

Subjects:

Computation and Language (cs.CL); Artificial Intelligence (cs.AI); Human-Computer Interaction (cs.HC)

Cite as: arXiv:2609.35804 [cs.CL]

(or arXiv:2609.35804v1 [cs.CL] for this version)

https://doi.org/10.48550/arXiv.2609.35804

arXiv-issued DOI via DataCite (pending registration)

Journal reference: Neural Information Processing (ICONIP 2024), Lecture Notes in Computer Science (LNCS), vol. 15290, pp. 361-374, Springer, 2025

Related DOI:

https://doi.org/10.1007/978-981-96-6588-4_25

DOI(s) linking to related resources

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From: Ahmad Shahi [view email] [v1] Fri, 18 Sep 2026 10:25:05 UTC (119 KB)

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  • arXiv:2609.35804v1 Announce Type: new Abstract: Large language models (LLMs) have shown remarkable capabilities in various natural language processing tasks, leading to their wide…

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