The humanoid race is on, and software is a key to win. Flexion Robotics is building the full autonomy stack for humanoid robots, from command to control and manipulation to locomotion, deployable across any hardware and any task. Trained in simulation, scaled to the real world with minimal human involvement. In this conversation, Flexion Robotics and Prosus Ventures discuss what it takes to build foundational software for physical AI in Europe, why reinforcement learning is the key to scalable autonomy, and whether Europe can claim a leading position in a fast-moving field on the verge of consolidation.