RP1 humanoid

01 / What it was

RoboParty publishes the RP1, an open-source humanoid robot, with its description files and pretrained policies. We used the same pattern as the duck to bring its 24-joint variant into the world.

It was spawned and danced on the stream early on 28 October: "Now it's truly online."

02 / How it worked

• MuJoCo with a 50 Hz policy, using RoboParty's own policies for walking, a wave learned from a motion clip, and a dance.
• The hardware joint gains came first; with them the robot stood and turned but did not walk forward. The gains from RoboParty's training setup fixed it.
• Measured: walking at 0.395 m/s, turns of about 86 degrees in 2.6 s, and two 10-minute runs of random commands with no falls.
• One sim metre is one block, so it stands about 1.5 blocks tall.
• A persona with its own voice; while it talks, a small sway is added to the standing policy.

03 / What we saw

Unlike the duck, it cannot see Minecraft blocks: it walked through walls in a demo. It would not follow on voice command, and there is no get-up policy, so every fall ends in a reset.

04 / Where it led

It raised the question a friend asked on the call: can a robot like this do real work, "like hold something"?

Sources

1. Stream analysis. stream transcript analysis, 28 Oct 2026 Now it's truly online.
2. Stream analysis. stream transcript analysis, 28 Oct 2026 rp1 follow me and it's not working but maybe the ducks
3. Simulation notes (local, not published). RP1 simulation README, Oct 2026 Only a flat floor; the robot can't see Minecraft blocks.
4. Robots paper, sources (RoboParty's RP1 description files are credited there). /research/robots/ RoboParty publishes the RP1's description files [S8] and deploy code with pretrained policies [S9].