Author

Haoze Wu

LLM, RL, Agent

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Preprint Aug 2026

Beyond Outcome Rewards: Step-Level Self-Distilled Policy Optimization for Deep Search Agents

Evidence Anchors are constructed, which are concise, step-level evidence snippets extracted from the web, as privileged information that captures key reasoning steps without revealing the entire answer path, and SSPO, which converts teacher-student disagreement into step-level advantage weights within GRPO, applied exclusively to incorrect trajectories.

Haoze Wu, Chuqiao Kuang, Tianyi Zhuang et al. · 0 citations