Tiny Model, Big Logic: Diversity-Driven Optimization Elicits Large-Model Reasoning Ability in VibeThinker-1.5B. - Sen Xu; Yi Zhou; Wei Wang; Jixin Min; Zhibin Yin; Yingwei Dai; Shixi Liu; Lianyu Pang; Yirong Chen; Junlin Zhang (CoRR, 2025)