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I am currently in the MSCS program at UIUC, advised by Prof. Jiaxuan You. I am also a researcher in the MIT Brain and Cognitive Sciences department, working with Prof. Evelina Fedorenko and Dr. Andrea de Varda in the EvLab. During my undergrad, I was fortunate to work with Prof. Anima Anandkumar (Caltech) and Dr. Rafał Kocielnik (Caltech). I also previously interned at NVIDIA. 韩芃睿 / Email / Google Scholar / GitHub / LinkedIn / Twitter |
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[Sep 2025] Honored to receive the Best Paper Honorable Mention Award @ NeurIPS LAW Workshop, for our Personality Illusion paper. |
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My research aims to advance scientific understanding of AI (especially neural models like LLMs), and more broadly, the general principles of intelligence and intelligent behavior. I approach this goal across three interconnected levels:
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Pengrui Han*, Rafal D. Kocielnik*, Peiyang Song, Ramit Debnath, Dean Mobbs, Anima Anandkumar, and R. Michael Alvarez (* Equal Contribution) NeurIPS LAW Workshop: Bridging Language, Agent, and World Models, 2025, Oral Presentation + Best Paper Honorable Mention NeurIPS Workshop on LLM Persona Modeling (PersonaNLP), 2025, Oral Presentation arXiv / project / code LLMs say they have personalities, but they don’t act like it. Alignment today shapes language, not behavior. This linguistic–behavioral dissociation cautions against equating coherent self-reports with cognitive depth. |
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Peiyang Song*, Pengrui Han*, and Noah Goodman (* Equal Contribution) ICML AI for Math Workshop, 2025 preprint / full release coming soon We present the first comprehensive survey dedicated to reasoning failures in LLMs. By unifying fragmented research efforts, our survey provides a structured perspective on systemic weaknesses in LLM reasoning, offering valuable insights and guiding future research towards building stronger, more reliable, and robust reasoning capabilities. |
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Pengrui Han*, Peiyang Song*, Haofei Yu, and Jiaxuan You (* Equal Contribution) Findings of Empirical Methods in Natural Language Processing (EMNLP), 2024 code Motivated by the crucial cognitive phenomenon of A-not-B errors, we present the first systematic evaluation on the surprisingly vulnerable inhibitory control abilities of LLMs. We reveal that this weakness undermines LLMs' trustworthy reasoning capabilities across diverse domains, and introduce various mitigations. |
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Pengrui Han*, Rafal Kocielnik*, Adhithya Saravanan,Roy Jiang, Or Sharir,and Anima Anandkumar (* Equal Contribution) Conference On Language Modeling (COLM), 2024 code We propose a light and efficient pipeline that enables both domain and non-domain experts to quickly generate synthetic debiasing data to mitigate specific or general bias in their models with parameter-efficient fine-tuning. |
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Guanyu Lin*, Tao Feng*, Pengrui Han*, Ge Liu, Jiaxuan You (* Equal Contribution) System Demonstration Track of Empirical Methods in Natural Language Processing (EMNLP), 2024 Huggingface Live Demo: Link We propose a light and efficient pipeline that enables both domain and non-domain experts to quickly generate synthetic debiasing data to mitigate specific or general bias in their models with parameter-efficient fine-tuning. |
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Tao Feng*, Pengrui Han*, Guanyu Lin*, Ge Liu, Jiaxuan You (* Equal Contribution) ICLR Workshop on How Far Are We From AGI, 2024 We introduce Thought-Retriever a novel model-agnostic algorithm that enables LLMs to effectively utilize external data without being limited by context length. |
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Adhithya Saravanan, Rafal Kocielnik, Roy Jiang, Pengrui Han, and Anima Anandkumar NeurIPS Workshop on Failure Modes in the Age of Foundation Models, 2023 Proceedings of Machine Learning Research (PMLR) We explore the social biases in text-to-image diffusion models used in commercial applications like image editing. By analyzing models like Stable Diffusion, we uncover significant biases, emphasizing the need for careful consideration when adopting these technologies for broader use.
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