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Zechen Sun

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#artificial intelligence Preprint Sep 2026

Verify Before You Distill: Prompt-Level Teacher Gating for On-Policy Distillation

Teacher-Gated On-Policy Distillation is introduced, built on the principle that teacher reliability should be verified at the prompt level before dense supervision is admitted, and outperforms Vanilla OPD in all six single-domain settings and achieves higher seven-benchmark averages at both scales under multi-domain tr...

Zhi-Wei Zhang, Zechen Sun, Fei Zhao et al. · 6 citations
Review Open access 2026

Data Foundations of Long-Context Language Models: A Survey

As the context window of Large Language Models (LLMs) continues to expand, the data required to effectively train and evaluate these capabilities remains underexplored. With existing research primarily focuses on architectural optimization, there is a need for a systematic, data-centric review. This survey bridges th...

Zechen Sun, Yu-Yang Sun, Zhao-yu Su et al. · 0 citations

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