Best Open-Source Humanoid Robots in 2026, Ranked by How Open They Really Are

Reachy 2 ranks first because Pollen Robotics releases both its hardware and its software and names the licence: Apache 2.0, which lets you use, change and sell your own versions if you keep the credits. Few humanoid makers say this so plainly. It is a wheeled upper-body humanoid, so it does not walk. Its two arms move like human arms and each carries about 3 kg, which is enough for tools, small parcels and everyday objects. A person can also drive it remotely wearing a virtual reality headset, which is a handy way to teach it a task by example. Its height adjusts from 136 to 166 cm and it weighs up to 50 kg. It suits a university or company team that wants to study how robots handle objects and is free to change the design.

ROBOTO ORIGIN comes second because RoboParty, when it released the robot in January 2026, published nearly everything: drawings, parts list, circuit boards, firmware, simulator files, and the code for training and running it. The project text is under the GPL-3.0 licence, so anyone who shares a changed version must share their changes too. It is a 1.25 m, 34 kg walking prototype with 23 motorised joints that runs at about 3 m/s, and the team built it in roughly four months. It loses the top spot because RoboParty says the motion-control algorithms that run on the robot are still to be added. Expect real assembly and tuning work. It suits makers, students and robotics clubs who want to learn by building a walking humanoid from public files.

Asimov v1 takes third place. Menlo Research marks its mechanical drawings (seven sub-assemblies), wiring, circuit schematics and board files, simulation model and onboard software as complete, with the hardware under the CERN Open Hardware Licence and the software under GPL-2.0. The robot is 1.2 m tall, weighs 35 kg and has 25 motorised joints. Menlo also publishes the parts list and assembly manual, so you can source the pieces yourself, and it offers a kit for people who would rather not. Its roadmap still lists the walking policy and a module called Asimov Edge as upcoming, which means the body is open before some of the software is. It suits a small team that wants a well-documented, human-sized platform and can wait for the last software pieces.

AgiBot X1 is the rare product from a large Chinese humanoid maker that ships with public designs: a parts list, STEP and SolidWorks drawings, an assembly procedure, and code repositories for running and training the robot. That gives a lab a complete starting point from a company with real manufacturing experience. The X1 stands 130 cm tall, weighs 33 kg and has 29 joints plus two grippers, and the head can take three more joints. It sits fourth because the developer guide states no licence, so the rules for reuse are unclear. Anyone planning a commercial product should ask AgiBot first. It suits a university or company lab that wants a mid-size walking platform from a maker with a track record and will confirm the reuse terms directly.

Bruce ranks fifth. Westwood Robotics calls this kid-size humanoid completely open source for research and education, but says its wiki and code are open to Bruce developers and community members, so you may need to join before you can see everything, and no licence is named. It stands 70 cm tall, weighs 4.8 kg and has 16 joints, five in each leg and three in each arm. The light carbon fibre frame suits walking, balancing and jumping tests, and the robot is small enough to be safe to use around people, which suits classroom work as well as lab benches. It suits a lab or school studying how legged robots walk and balance, and it is the smallest robot on this list.

Sourccey ranks sixth because its open status is the least documented of the released projects. Coverage says Vulcan Robotics publishes its hardware, electronics and software designs and offers printable parts files, but no licence is stated and reports differ on the release date. It rolls on four mecanum wheels, which let it slide sideways, stands 1,030 mm tall, weighs just under 16 kg and has two five-joint arms with grippers. Most of the body is 3D printed, so a replacement part can come off your own printer. Some sources question whether a wheeled robot counts as a humanoid. It suits hobbyists who want to teach a robot household tasks, such as folding clothes, by showing it what to do.

RP1 ranks last because its openness is a promise, not a release. RoboParty showed it at the IROS 2026 robotics conference on 28 September 2026 and calls it a full-stack open-source humanoid, but its press release says only the earlier ROBOTO ORIGIN is public. The RP1 body, motor modules, motion control, simulator and developer tools are due later, and the company planned to share its roadmap in October 2026. It stands 1.35 m tall, weighs about 39 kg, runs at up to 4 m/s and carries up to 5 kg per arm. The same team delivered on a similar promise once, so it is worth watching. To build something today, choose one of the robots above.