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arXiv 2026 Preprint

Rethinking On-Policy Distillation of Large Language Models II: One Training Example

Investigating why on-policy distillation can recover much of full-data training’s gain from a single query.

Zixuan Fu, Bingxiang He, Yuxin Zuo, Haohuan Huang, Jinqian Zhang, Ruhang Xiao, Cheng Qian, Qinyu Luo, Huan-ang Gao, Yudong Wang, Zhiyuan Liu, Ning Ding, Chaojun Xiao

Fig. 1 — One-shot distillation and multi-teacher OPD: the original headline results.Original source ↗
One-Shot On-Policy Distillation
Original One-Shot OPD key result: one query recovers most full-data gains, while 16-query multi-teacher OPD matches full-data training.

Fig. 1 — One-shot distillation and multi-teacher OPD: the original headline results.

01 / The question

How much training data does on-policy distillation actually need?

02 / The approach

One-Shot On-Policy Distillation

The work compares one-shot and full-data distillation across models and tasks, measuring the states reached by student rollouts and the pace of teacher–student alignment. It connects gains from query diversity to state coverage and examines why absorbing that supervision still takes many updates.

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03 / Citation

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04 / Versions & records

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