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ManufacturerROBOTIS Co., LtdRobot model · No. 2

AI Sapiens K1

Humanoid Robots · Research & Development

In developmentSouth Korea
Key factDYNAMIXEL-Q QDD · 48 V
Model details

Model specifications

Actuator PlatformDYNAMIXEL-Q QDD
Actuator System Voltage48 V
ArchitectureQuasi-Direct Drive (QDD)
AvailabilityActive Development / Early Product & Platform Preview / Open-Source Development Platform
FeedbackDual encoders.
Height1,355–1,366 mm, depending on current ROBOTIS documentation/revision. The September 2026 technical documentation states 1,355 mm, while ROBOTIS America's current early product preview states 1,366 mm. I recommend 1,355 mm for the research configuration documented by ROBOTIS, with a revision note.
Human Motion RetargetingYES
Isaac LabYES
Left arm5 DoF
Left leg6 DoF
Main ComputeNVIDIA Jetson Orin NX 16GB
ModelAI Sapiens K1
Motion MimicYES
MotorFrameless BLDC
MuJoCo/MJLabYES
NationalitySouth Korea
Open SourceYES.
Product TypeOpen-Source Bipedal Humanoid / Physical AI Development Platform
Python SDKYES
Reinforcement LearningYES
Revision documentedK1 Rev.1
Right arm5 DoF
Right leg6 DoF
ROS 2YES
Sim2RealYES
Text Motion InputYES — Kimodo
Total Degrees of Freedom23 DoF
Video Motion InputYES — GEM-X
Waist1 DoF
Weight35 kg
Whole-Body Motion LearningYES

About the AI Sapiens K1

ROBOTIS AI Sapiens K1 is a 23-DoF, approximately 1.36-meter, 35-kg open-source bipedal humanoid designed specifically for Physical AI research, education and robot development. Powered by DYNAMIXEL-Q quasi-direct-drive actuators and NVIDIA Jetson Orin NX computing, K1 provides a real-hardware platform for reinforcement-learning locomotion, whole-body motion imitation, human-to-robot motion retargeting and simulation-to-real policy deployment. ROBOTIS integrates K1 with ROS 2, NVIDIA Isaac Lab, MuJoCo/MJLab and open-source development resources so researchers and developers can train humanoid behaviors in simulation and execute them on physical hardware.

Typical applications: Research & Development, Education & Training, Development Platform.

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