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Portrait of Siddarth Mamidanna

Siddarth Mamidanna

I'm a Computer Science undergraduate student at UC Santa Cruz researching LLM interpretability, explainability, and safety with Prof. Leilani Gilpin.

Update: I'll be joining the University of Cambridge as a PhD in Computer Science this fall!

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Research

My primary research focus is in mechanistic interpretability and safety. I'm particularly interested in applying interpretability techniques for real-world applications.

I began my research journey in 2023 in Prof. Gilpin's lab (AIEA), where I co-first authored a paper on LLM explainability that now has 100+ citations. In this past year, I collaborated with Yilun Zhou and Prof. Ziyu Yao on mechanistic interpretability research, resulting in a paper accepted to EMNLP 2025. I've also explored broader LLM applications through work with Prof. Ben Nye and Joel Walsh at the USC Institute for Creative Technologies in 2024, writing a paper focusing on fine-tuning vs. few-shot approaches for automated grading. I'm now working on monitoring LLM outputs and reasoning traces using mechanistic tools, and would love to talk more about my research--please don't hesitate to get in touch.

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Publications

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All for One: LLMs Solve Mental Math at the Last Token With Information Transferred From Other Tokens

Siddarth Mamidanna, Daking Rai, Ziyu Yao, Yilun Zhou

EMNLP, 2025

A mechanistic study of mental-math behavior in language models, arguing that the final token solution depends on information routed forward from earlier token positions.

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Can LLMs Explain Themselves? A Study of LLM-Generated Self-Explanations

Shiyuan Huang*, Siddarth Mamidanna*, Shreedhar Jangam, Yilun Zhou, Leilani H. Gilpin

arXiv, 2023

An evaluation of model-written explanations that asks when self-explanations track the underlying computation and when they behave more like polished post-hoc justifications.

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A Comparison of Fine-Tuning and Few-Shot Approaches for AI-based Short Answer Grading

Joel Walsh*, Siddarth Mamidanna*, Benjamin Nye, Mark Core, Daniel Auerbach

AIED Workshop, 2025

A comparison of fine-tuning and few-shot methods for AI-based short-answer grading.

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Writing

coming soon :)

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Contact

If you're interested in my work, would like to collaborate, or just want to chat, please feel free to reach out.