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Zhengyu Chen

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#machine learning Preprint Sep 2026

Long-Horizon Scaling: How Model Capabilities Shape the Returns to Computation

It is found that starting performance and subsequent growth are associated with different capabilities: within a task category, similar early scores can precede different later gains, and a continuation policy to save time and compute with limited score loss is derived.

Hao-Yu Zheng, Zheng-Yu Chen, Huai-Sheng Zhu et al. · 0 citations
Jul 2026

Distilling Temporal Search and Reasoning: Evolving LLMs for Future Prediction via Harness-Assisted Efficient Data Synthesis

A time-truncation harness is proposed that enforces a temporal cut-off at every turn, enabling TIR-style sampling from historical events, enabling TIR-style sampling from historical events, reducing temporal leakage and reliance of rejection sampling or unsolved queries, increasing the sampling efficiency.

Wanxu Cai, Zheng-Yu Chen, Huai-Sheng Zhu et al. · 0 citations
Preprint Aug 2026

Beyond Final Scores: A Systematic Evaluation of Agents for Long-Horizon AI Research and Development

A systematic evaluation of seven frontier models on 36 long-horizon tasks based on a new framework that uses rule-based metrics to characterize within-run behavior through Solution Framing, Execution, and Feedback Control and controlled comparisons to assess experience reuse within and across tasks is presented.

Yi-Wei Li, Wanli Yang, He-Xiang Tan et al. · 1 citation
Jul 2026

Rethinking the Evaluation of Harness Evolution for Agents

An extensive evaluation of automatic harness evolution for LLM agents is conducted, comparing harness evolution with simple test-time scaling and discovery baselines under comparable feedback and inference budgets, and also evaluating evolved harnesses on held-out tasks to assess whether the discovered improvements gen...

Yike Wang, Huaisheng Zhu, Zhengyu Hu et al. · 18 citations
#artificial intelligence Preprint May 2026

When the Strongest Teacher Is Not the Best Teacher: Student-Centric Answer Selection

Student-Centric Answer Sampling (SCAS) is proposed, a framework that selects from verified teacher-generated answers according to their estimated student-centric learning cost and is derived by a token-wise gradient decomposition and used to guide answer selection during training.

Zhengyu Hu, Zheyuan Xiao, Linxin Song et al. · 0 citations
Preprint Aug 2026

HarnessCompass: Guiding Automatic Harness Evolution toward Generalizable and Effective Agent Harnesses

HarnessCompass is proposed, a novel automatic harness evolution framework built around constrained evolution, proactive feedback, and component-wise optimization that improves Pass@1 from 54\% to 66\% in only 5 evolution iterations, outperforming AHE in both effectiveness and evolution efficiency.

Luan Zhang, Ruo-Chen Zhou, Dan-Dan Song et al. · 10 citations · ⚡1
Jul 2026

Co-Harness: Co-Evolving Harnesses and Model Weights for LLM Agents

Co-Harness is introduced, a framework that jointly optimizes the agent harness and model parameters during post-training and suggests that joint harness and model optimization is an effective way to improve agents beyond fixed-harness post-training.

Zhengyu Chen, Teng Xiao, Huaisheng Zhu et al. · 4 citations

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