HALoGEN: Fantastic LLM Hallucinations and Where to Find Them (2025.acl-long)

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Challenge: generative large language models produce hallucinations that are not aligned with world knowledge or input context.
Approach: They propose a hallucination benchmark framework that measures hallucinism in large language models . they evaluate 150,000 generations from 14 language models and find they are riddled with hallucinos .
Outcome: The proposed framework evaluates 150,000 generations from 14 language models.

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UHGEval: Benchmarking the Hallucination of Chinese Large Language Models via Unconstrained Generation (2024.acl-long)

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Challenge: Large language models (LLMs) produce hallucinated text, compromising their practical utility in professional contexts.
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HaluEval: A Large-Scale Hallucination Evaluation Benchmark for Large Language Models (2023.emnlp-main)

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Challenge: Existing large language models (LLMs) are prone to generate hallucinations . a recent study shows that LLMs are able to generate content that conflicts with the source or cannot be verified by factual knowledge.
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Language Models Hallucinate, but May Excel at Fact Verification (2024.naacl-long)

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Challenge: Recent advances in large language models (LLMs) have produced non-factual outputs . however, current LLMs suffer from the hallucination issue .
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ANAH: Analytical Annotation of Hallucinations in Large Language Models (2024.acl-long)

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Challenge: a comprehensive and fine-grained measurement of the hallucination is crucial for LLMs' wide applications.
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HalluLens: LLM Hallucination Benchmark (2025.acl-long)

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Challenge: Large language models (LLMs) generate responses that deviate from user input or training data, a phenomenon known as "hallucination" .
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InterrogateLLM: Zero-Resource Hallucination Detection in LLM-Generated Answers (2024.acl-long)

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Challenge: Existing methods for detecting hallucinations in large language models are limited due to their high frequency and high accuracy.
Approach: They propose a method to detect hallucinations in large language models by repeating model-generated responses from its generated answer.
Outcome: The proposed method achieves 87% hallucinations in a specific experiment without external knowledge.
The Troubling Emergence of Hallucination in Large Language Models - An Extensive Definition, Quantification, and Prescriptive Remediations (2023.emnlp-main)

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Challenge: Recent advances in Large Language Models have generated widespread acclaim, but hallucination has also emerged as a by-product.
Approach: They propose a fine-grained discourse on profiling hallucination based on its degree, orientation, and category . they categorize hallucines into six types: acronym ambiguity, generated golem, virtual voice, geographic erratum, time wrap .
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The Dawn After the Dark: An Empirical Study on Factuality Hallucination in Large Language Models (2024.acl-long)

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Challenge: a growing number of researchers are studying the hallucination issue in large language models.
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Tutorial Proposal: Hallucination in Large Language Models (2024.lrec-tutorials)

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Challenge: Grasping the intricacies of hallucination in LLMs can be daunting, especially for those new to the field.
Approach: This tutorial aims to bridge the gap between the field and the field of hallucination . it will explore the key aspects of hallucinonation, including benchmarking, detection, and mitigation techniques .
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Simple Factuality Probes Detect Hallucinations in Long-Form Natural Language Generation (2025.findings-emnlp)

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Challenge: Current approaches to detect hallucination require many samples from the LLM generator . current methods require multiple samples, which is computationally infeasible .
Approach: They propose a simple baseline for detecting hallucinations in long-form LLM generations . they show that LLM hidden states are highly predictive of factuality in long form natural language generation .
Outcome: The proposed method is comparable to expensive multi-sample approaches while drawing only a single sample from the LLM generator.

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