Efficiently Scaling LLM Reasoning Programs with Certaindex - Fu, Yichao; Chen, Junda; Zhu, Siqi; Fu, Fu; Dai, Zhongdongming; Zhuang, Yonghao; Ma, Yian; Qiao, Aurick; Rosing, Tajana S; Stoica, Ion; Zhang, Hao (Advances in Neural Information Processing Systems, 2025)