NEO's Hands
1X's new humanoid hand runs its tendons at a tenth the usual gear ratio, so every joint is soft enough to feel what it touches — and dexterous enough to sort grapes and thread a screwdriver.
Most robot joints are geared down 100-to-1 or more: stiff, strong, and blind, unable to feel the thing they grip. The 25-jointed hand 1X revealed for its NEO humanoid runs its tendons at roughly a tenth of that, motors tucked back in the forearm pulling cables the way real tendons do. The payoff is that the whole hand is backdrivable — push on a finger and it gives — and force-controlled, which turns every joint into its own sensor. In the demo video it assembles LEGO, picks up single coins, spins a light bulb into a socket, pours tea, and signs in sign language, at a claimed fifth-of-a-millimetre precision.
The engineering bet is real and distinct from the field. Tesla, Figure, and Boston Dynamics mostly build stiffer, harmonic-drive hands; 1X is wagering that soft, feeling, backdrivable fingers are the path to human-grade manipulation, and that it can make them at scale — hundreds already built, ten thousand targeted this year, sensors and motors in-house.
The catch is the reversal underneath the demo. 1X's own product head told Forbes the blazing-fast hands in the video are not the hands that will ship, and that NEO's AI probably can't yet exploit all that hardware anyway. So this is the rare robotics milestone where the body has outrun the brain: the fingers can do more than the software knows how to ask of them. Whether tendon-driven hands beat the harmonic-drive crowd now hinges not on the mechanism but on the data to drive it.
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