Rho released as an open-weights family of 5B robot models

A post announcing Rho describes it as a family of open-weights 5B vision-language-action models underlying Microsoft Research’s Rho-alpha VLA+ work. It claims robot-midtrained Rho outperforms the strongest existing open-weights models of that kind on physical robots and in simulation. The announcement also says pairing Rho with FlowDAgger’s online corrections after offline fine-tuning makes adaptation to new tasks more data-efficient.