Author

An-Xin Guo

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Preprint Oct 2026

Copying Under Repetition: From Prefix Matching to Position Hashing

Frontier LLMs can copy random text almost flawlessly, yet they often overrun or truncate long blocks of repeated characters. In repeated strings, matching local content no longer reliably identifies where copying should continue or when it should stop. Nevertheless, we show that a two-layer transformer with $O(\log\log...

An-Xin Guo, Tian-Long Huang, Chen-Xiao Yang et al. · 0 citations

#machine learning Preprint Oct 2026

How Much Do You Trust A Dog? Quantifying Hint-Following in Reasoning Language Models

Large language models (LLMs) often exhibit sycophancy, altering their answers to align with user suggestions even on objective factual and reasoning tasks. Yet the quantitative form of this influence--- and whether it is calibrated to source reliability--- remains poorly understood. In this work, we investigate this be...

An-Xin Guo, Chirag Pabbaraju, Sara Ahmadian et al. · 0 citations