Zheng Li Siyao Song Jingyuan Ma Rui Li Ying Zeng Minghao Li Zhifang Sui TeachBench: A Syllabus-Grounded Framework for Evaluating Teaching Ability in Large Language Models. 2026 January abs/2601.21375 CoRR https://doi.org/10.48550/arXiv.2601.21375 db/journals/corr/corr2601.html#abs-2601-21375 streams/journals/corr