MMR-V: What extquotesingle s Left Unsaid? A Benchmark for Multimodal Deep Reasoning in Videos - Zhu, Kejian; Jin, Zhuoran; Yuan, Hongbang; Li, Jiachun; Tu, Shangqing; Cao, Pengfei; Chen, Yubo; Liu, Kang; Zhao, Jun (International Conference on Learning Representations, 2026)