SocialOmni: Benchmarking Audio-Visual Social Interactivity in Omni Models. - Tianyu Xie 010; Jinfa Huang; Yuexiao Ma; Rongfang Luo; Yan Yang; Wang Chen; Yuhui Zeng; Ruize Fang; Yixuan Zou; Xiawu Zheng; Jiebo Luo 001; Rongrong Ji (CoRR, 2026)