UI-Venus-1.5 Technical Report
Authors: name: Veuns-Team, name: Changlong Gao, name: Zhangxuan Gu, name: Yulin Liu, name: Xinyu Qiu, name: Shuheng Shen, name: Yue Wen, name: Tianyu Xia, name: Zhenyu Xu, name: Zhengwen Zeng, name: Beitong Zhou, name: Xingran Zhou, name: Weizhi Chen, name: Sunhao Dai, name: Jingya Dou, name: Yichen Gong, name: Yuan Guo, name: Zhenlin Guo, name: Feng Li, name: Qian Li, name: Jinzhen Lin, name: Yuqi Zhou, name: Linchao Zhu, name: Liang Chen, name: Zhenyu Guo, name: Changhua Meng, name: Weiqiang Wang
Organization: inclusionAI

GUI agents have emerged as a powerful paradigm for automating interactions in digital environments, yet achieving both broad generality and consistently strong task performance remains challenging.In this report, we present UI-Venus-1.5, a unified, end-to-end GUI Agent designed for robust real-world applications.The proposed model family comprises two dense variants (2B and 8B) and one mixture-of-experts variant (30B-A3B) to meet various downstream application scenarios.Compared to our previous version, UI-Venus-1.5 introduces three key technical advances: (1) a comprehensive Mid-Training stage leveraging 10 billion tokens across 30+ datasets to establish foundational GUI semantics; (2) Online Reinforcement Learning with full-trajectory rollouts, aligning training objectives with long-horizon, dynamic navigation in large-scale environments; and (3) a single unified GUI Agent constructed via Model Merging, which synthesizes domain-specific models (grounding, web, and mobile) into one cohesive checkpoint. Extensive evaluations demonstrate that UI-Venus-1.5 establishes new state-of-the-art performance on benchmarks such as ScreenSpot-Pro (69.6%), VenusBench-GD (75.0%), and AndroidWorld (77.6%), significantly outperforming previous strong baselines. In addition, UI-Venus-1.5 demonstrates robust navigation capabilities across a variety of Chinese mobile apps, effectively executing user instructions in real-world scenarios. Code: https://github.com/inclusionAI/UI-Venus; Model: https://huggingface.co/collections/inclusionAI/ui-venus