Best small humanoid robots for research (2026)

By Tolerance Labs engineering team · Updated 13 October 2026

How this list was made. We sell the HighTorque robots below. Other makers’ models are included where they compete, and link to their makers. Rankings use the makers’ published specifications, normalized to the same units; we have not bench-tested every model. More on how we write these.

Small humanoid and bipedal robots are the cheapest way to work on walking, whole-body control and sim-to-real learning on real hardware. This guide compares research platforms from a half-metre biped to 1.4 m humanoids by size, degrees of freedom, onboard compute, software access and price.

Picks

• Lowest listed price with an open SDK: HighTorque Mini Pi 12-DoF – Base ($4,981.90, 12 DoF).
• Lightest full humanoid (arms and legs, 20 DoF or more): ROBOTIS OP3 (3.5 kg, 510 mm tall).
• Most degrees of freedom: Unitree G1 EDU (23–43 DoF).

Every research humanoid compared

DoF counts the actuated joints the maker lists; a range means it depends on the version. “None (EDU only)” means the base model doesn’t run your own control code; only the EDU version does. Makers’ list prices were checked on the date at the top and change often.

Size changes what you can do

A robot under about 15 kg can be carried by one person, tested on a desk or a small mat, and survives falls with little damage, so you can run many experiments a day. Robots of 30 kg or more need a gantry or harness while you test, two people to move and a larger lab, but they can open doors, carry useful loads and use human tools. Many labs develop a walking policy on a small robot and move it to a larger one later.

What to look for when buying

• Low-level access. Check that the version you buy lets you send joint commands or torques from your own code. Some base models only run the maker’s app; the SDK comes with a more expensive EDU version.
• Simulation support. A URDF or MJCF model and examples for Isaac Lab or MuJoCo let you train a policy before it touches the hardware.
• Onboard compute. A GPU module such as NVIDIA Jetson Orin runs vision and learned policies on the robot; a CPU-only robot needs a tethered PC for that.
• Degrees of freedom. 12 DoF covers two legs. A full humanoid adds arms, a waist and a head for 20 or more. Hands add more again.
• Battery and runtime. Runtimes of 20 minutes to 2 hours are typical. Swappable batteries keep a test day going.
• Repairs and spare joints. Falls are part of the work. Ask whether joint actuators can be bought and replaced on their own, and how long spares take to arrive. See HighTorque joint modules.
• Landed cost. Compare the delivered price, including duties and freight. Our product prices include freight, import duties and tariffs, so nothing is added at checkout.

Browse the robots we sell in humanoid and legged robots, or compare them in HighTorque Mini Pi and Mini Hi.