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Zi-Xiang Xu

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#artificial intelligence Preprint Sep 2026

GTA: Graph Theory Agent and Benchmark for Algorithmic Graph Reasoning with LLMs

The Graph Theory Agent (GTA), which pairs a preference-trained representation selector with plan-and-decompose scaffolding around a frozen executor LLM, is proposed, which lifts Phi-4 from 53.5% to 69.1% on the benchmark's easy split and from 33.0% to 41.5% on its hard split.

Zi-Xiang Xu, Yan-Bo Wang, Chenxi Wang et al. · 2 citations · ⚡1
#natural language process... Preprint May 2025

SocialMaze: A Benchmark for Evaluating and Enhancing Social Reasoning in Large Language Models in Complex Social Environments

SocialMaze is introduced, a benchmark that organizes six tasks across social deduction games, daily-life interactions, and digital community platforms along three descriptive design axes: deep reasoning, dynamic interaction, and information uncertainty.

Zi-Xiang Xu, Yan-Bo Wang, Yue Huang et al. · 1 citation
Jul 2026

Inside the Unfair Judge: A Mechanistic Interpretability Account of LLM-as-Judge Bias

Existing studies of LLM-as-judge scoring bias work predominantly at the input-output level: they perturb inputs, measure score deltas, and propose prompt-level mitigations. We argue that the same biases admit a representation-level account in the judge's hidden state, complementary to the input-output view and operatio...

Zixiang Xu, Sixian Li, Hua-Xing Liu et al. · 2 citations

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