We present Fara1.5, a family of lightweight Computer Use Agent (CUA) models at three scales 4B, 9B, and 27B -- each achieving state-of-the-art results on browser-use benchmarks among models of comparable size (e.g., 56.6% on Online-Mind2Web and 84.9% on WebVoyager for Fara1.5-9B). These models are the next evolution of Fara-7B and make many advancements, such as more robust user interaction/oversight, more efficient task execution, and overall stronger task completion performance. The key driver behind these models’ capabilities is our synthetic data generation pipeline, FaraGen1.5, that builds synthetic environments and tasks at scale, has agents attempt them to collect demonstrations, and filters the resulting trajectories with a robust verifier. Overall, the Fara1.5 family of models delivers strong performance while being cost-effective and capable of running on-device or modest hardware.