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Yukyung Lee

Boston University

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#artificial intelligence Preprint Jun 2026

Cliff Tokens: Analyzing Failure Trigger Tokens in LLM Mathematical Reasoning

This work introduces the cliff token, a token at which the estimated probability of reaching the correct answer (success probability) drops beyond an adaptive threshold, and introduces a cliff taxonomy of deterministic, uncertain, and sampled-off cliffs, defined by greedy choice and token entropy.

J. Ko, Jinu Lee, Pilsung Kang et al. · 0 citations
#artificial intelligence Review Sep 2026

Harbor Adapters and Harbor-Index: Infrastructure and a Curated Meta-Dataset for Large-Scale Agentic Evaluation

Harbor Adapters are developed that port more than 80 benchmarks to evaluate arbitrary agents, and validated through rigorous code review and parity experiments, and Harbor-Index is introduced, a curated set of 82 difficult, diverse, and high-quality tasks spanning 29 benchmarks to support more reliable and comprehensiv...

Lin Shi, Hao-Wei Lin, Zi-Xuan Zhu et al. · 1 citation
#natural language process... Preprint Sep 2026

LLMs Learn Better In-Context from Rules than from Examples

It is found that models generally learn more reliably from rules than from examples alone, and additional examples on top of rules or simply scaling up the number of examples do not lead to consistent and significant gains.

Xiang Fu, Seungmin Cho, Yukyung Lee et al. · 0 citations
#natural language process... Preprint Aug 2026

AI Writers Have a Consistent Stylometric Footprint, but AI Editors Do Not

It is shown that AI generation leaves a consistent ``stylometric footprint'': a small subset of features, primarily entropy and lexical diversity, consistently separates AI-generated text from human writing across 8 LLMs and 5 domains, while the remaining features depend heavily on the domain and generator.

Zhengyang Shan, Yukyung Lee, Sophie Hao · 0 citations

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