From Absolute to Relative: Rethinking Reward Shaping in Group-Based Reinforcement Learning. - Wenzhe Niu; Wei He; Zongxia Xie; Jinpeng Ou; Huichuan Fan; Yuchen Ge; Yanru Sun; Ziyin Wang; Yizhao Sun; Chengshun Shi; Jiuchong Gao; Jinghua Hao; et al. (CoRR, 2026)

Hidden States Know Where Reasoning Diverges: Credit Assignment via Span-Level Wasserstein Distance. - Xinzhu Chen; Wei He; Huichuan Fan; Wenzhe Niu; Zhongxiang Sun; Xuanru Wang; Jiuchong Gao; Jinghua Hao; Renqing He; Weijie Yu (CoRR, 2026)