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url: https://arxiv.org/abs/2504.20799
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<title>[2504.20799] Hallucination by Code Generation LLMs: Taxonomy, Benchmarks, Mitigation, and Challenges</title>
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<meta name=description content="Abstract page for arXiv paper 2504.20799: Hallucination by Code Generation LLMs: Taxonomy, Benchmarks, Mitigation, and Challenges"><meta property=og:type content=website>
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<meta property=og:description content="Recent technical breakthroughs in large language models (LLMs) have enabled them to fluently generate source code. Software developers often leverage both general-purpose and code-specialized LLMs to revise existing code or even generate a whole function from scratch. These capabilities are also beneficial in no-code or low-code contexts, in which one can write programs without a technical background. However, due to their internal design, LLMs are prone to generating hallucinations, which are incorrect, nonsensical, and not justifiable information but difficult to identify its presence. This problem also occurs when generating source code. Once hallucinated code is produced, it is often challenging for users to identify and fix it, especially when such hallucinations can be identified under specific execution paths. As a result, the hallucinated code may remain unnoticed within the codebase. This survey investigates recent studies and techniques relevant to hallucinations generated by CodeLLMs. We categorize the types of hallucinations in the code generated by CodeLLMs, review existing benchmarks and mitigation strategies, and identify open challenges. Based on these findings, this survey outlines further research directions in the detection and removal of hallucinations produced by CodeLLMs.">
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<meta name=citation_title content="Hallucination by Code Generation LLMs: Taxonomy, Benchmarks, Mitigation, and Challenges"><meta name=citation_author content="Lee, Yunseo"><meta name=citation_author content="Song, John Youngeun"><meta name=citation_author content="Kim, Dongsun"><meta name=citation_author content="Kim, Jindae"><meta name=citation_author content="Kim, Mijung"><meta name=citation_author content="Nam, Jaechang"><meta name=citation_date content=2025/04/29><meta name=citation_online_date content=2025/05/13><meta name=citation_pdf_url content=https://arxiv.org/pdf/2504.20799><meta name=citation_arxiv_id content=2504.20799><meta name=citation_abstract content="Recent technical breakthroughs in large language models (LLMs) have enabled them to fluently generate source code. Software developers often leverage both general-purpose and code-specialized LLMs to revise existing code or even generate a whole function from scratch. These capabilities are also beneficial in no-code or low-code contexts, in which one can write programs without a technical background. However, due to their internal design, LLMs are prone to generating hallucinations, which are incorrect, nonsensical, and not justifiable information but difficult to identify its presence. This problem also occurs when generating source code. Once hallucinated code is produced, it is often challenging for users to identify and fix it, especially when such hallucinations can be identified under specific execution paths. As a result, the hallucinated code may remain unnoticed within the codebase. This survey investigates recent studies and techniques relevant to hallucinations generated by CodeLLMs. We categorize the types of hallucinations in the code generated by CodeLLMs, review existing benchmarks and mitigation strategies, and identify open challenges. Based on these findings, this survey outlines further research directions in the detection and removal of hallucinations produced by CodeLLMs.">
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[Submitted on 29 Apr 2025 (<a href=https://arxiv.org/abs/2504.20799v1>v1</a>), last revised 13 May 2025 (this version, v2)]</div>
<h1 class="title mathjax"><span class="descriptor sf-hidden">Title:</span>Hallucination by Code Generation LLMs: Taxonomy, Benchmarks, Mitigation, and Challenges</h1>
<div class=authors><span class="descriptor sf-hidden">Authors:</span><a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Lee,+Y" rel=nofollow>Yunseo Lee</a>, <a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Song,+J+Y" rel=nofollow>John Youngeun Song</a>, <a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Kim,+D" rel=nofollow>Dongsun Kim</a>, <a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Kim,+J" rel=nofollow>Jindae Kim</a>, <a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Kim,+M" rel=nofollow>Mijung Kim</a>, <a href="https://arxiv.org/search/cs?searchtype=author&amp;query=Nam,+J" rel=nofollow>Jaechang Nam</a></div> <div id=download-button-info hidden class=sf-hidden>View a PDF of the paper titled Hallucination by Code Generation LLMs: Taxonomy, Benchmarks, Mitigation, and Challenges, by Yunseo Lee and 5 other authors</div>
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<span class="descriptor sf-hidden">Abstract:</span>Recent technical breakthroughs in large language models (LLMs) have enabled them to fluently generate source code. Software developers often leverage both general-purpose and code-specialized LLMs to revise existing code or even generate a whole function from scratch. These capabilities are also beneficial in no-code or low-code contexts, in which one can write programs without a technical background. However, due to their internal design, LLMs are prone to generating hallucinations, which are incorrect, nonsensical, and not justifiable information but difficult to identify its presence. This problem also occurs when generating source code. Once hallucinated code is produced, it is often challenging for users to identify and fix it, especially when such hallucinations can be identified under specific execution paths. As a result, the hallucinated code may remain unnoticed within the codebase. This survey investigates recent studies and techniques relevant to hallucinations generated by CodeLLMs. We categorize the types of hallucinations in the code generated by CodeLLMs, review existing benchmarks and mitigation strategies, and identify open challenges. Based on these findings, this survey outlines further research directions in the detection and removal of hallucinations produced by CodeLLMs.
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<td class="tablecell label">Comments:</td>
<td class="tablecell comments mathjax">15 pages, 4 figures</td>
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<span class=primary-subject>Software Engineering (cs.SE)</span>; Artificial Intelligence (cs.AI)</td>
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<td class="tablecell label">Cite as:</td>
<td class="tablecell arxivid"><span class=arxivid><a href=https://arxiv.org/abs/2504.20799>arXiv:2504.20799</a> [cs.SE]</span></td>
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<td class="tablecell arxividv">(or <span class=arxivid>
<a href=https://arxiv.org/abs/2504.20799v2>arXiv:2504.20799v2</a> [cs.SE]</span> for this version)
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<td class="tablecell label">&nbsp;</td>
<td class="tablecell arxivdoi"> <a href=https://doi.org/10.48550/arXiv.2504.20799 id=arxiv-doi-link>https://doi.org/10.48550/arXiv.2504.20799</a><div class=button-and-tooltip>
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<h2>Submission history</h2> From: Jaechang Nam [<a href=https://arxiv.org/show-email/6c22194e/2504.20799 rel=nofollow>view email</a>] <br> <strong><a href=https://arxiv.org/abs/2504.20799v1 rel=nofollow>[v1]</a></strong>
Tue, 29 Apr 2025 14:13:57 UTC (575 KB)<br>
<strong>[v2]</strong>
Tue, 13 May 2025 11:51:35 UTC (589 KB)<br>
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