Overview
The classic research humanoid for learning ZMP/LIPM walking with full source. But it costs about 15× an AiNex for a similar size and walking style, and it's sold out in the US. Today's RL bipeds beat it on balance.
- Type
- Biped robot · Walks, but doesn't really balance
- Maker
- ROBOTIS
- Released
- 2017
- Price
- ~$12,000 – $13,800
- Status
- Out of stock
- Best for
- Professionals & labs
- Programming
- Open source (hardware + software)
Price and shipping
robotis.us $13,764 (sold out). RobotLAB quote
Shipping: Quote / weeks+. Sold out on robotis.us (ships from California when stocked). RobotLAB sells by quote. ROBOTIS US ↗
Specifications
| Category | Bipeds · Walks, but doesn't really balance |
|---|---|
| Released | 2017 |
| Country | South Korea |
| Availability | Out of stock |
| Programmability | Open source (hardware + software) |
| Built-in autonomy | Reactive · Responds to its surroundings without a map, such as avoiding obstacles or following a person |
| LLM support | Possible via SDK · Open ROS / ROS 2 and C++ stack, no built-in LLM. |
| MuJoCo simulation | Official model · In MuJoCo Menagerie (robotis_op3). MuJoCo Menagerie ↗ |
| NVIDIA Isaac simulation | Maker URDF only · ROBOTIS publishes the OP3 URDF in op3_description, with no Isaac asset. ROBOTIS-OP3-Common ↗ |
| Gazebo simulation | Official model · ROBOTIS's op3_gazebo package simulates OP3 in Gazebo. ROBOTIS-OP3-Simulations ↗ |
| Best for | Professionals & labs |
| Vision sensors | Camera |
| Actuators | Smart servos (Dynamixel, Feetech…) |
| Audio | Microphone |
| Compute type | x86 PC (Intel / AMD), Arduino / ESP32 / microcontroller |
| Balance type | ZMP / IK gait |
| Height | 51 cm |
| Weight | 3.5 kg |
| Compute | Intel NUC i3 + OpenCR |
| Speed | 0.24 m/s |
| DOF | 20 Dynamixel |
| Sensors | IMU, Logitech C920 camera, mics |
| Balance | ZMP preview-control walking on a linear inverted pendulum with gyro feedback. Handles small disturbances but doesn't recover from pushes (falls, then gets up). |
| SDK | ROS / ROS 2, C++, Dynamixel SDK, open CAD |
Common questions
How much does OP3 cost?
OP3 is listed at ~$12,000 – $13,800. robotis.us $13,764 (sold out). RobotLAB quote.
Can OP3 be bought today?
It is out of stock right now. Sold out on robotis.us (ships from California when stocked). RobotLAB sells by quote.
Who makes OP3?
OP3 is made by ROBOTIS. It came out in 2017.
Can OP3 be programmed?
Open source (hardware + software). ROS / ROS 2, C++, Dynamixel SDK, open CAD.
Does OP3 have AI chat or LLM support?
Possible via SDK. Open ROS / ROS 2 and C++ stack, no built-in LLM.
Ratings & reviews
Ratings and reviews load on the live site.
Related guides
- Robot Gaits and Gait Training · how legged robots walk, trot and gallop
- MuJoCo Guide · the simulator used to train walking robots
- ROS 2 Guide · the software framework many robots use
- Robot Vision and Depth Sensors · cameras, lidar and other distance sensors
Similar robots
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ROBOTIS MINI (DARwIn-MINI)ROBOTIS (South Korea)Was ~$500
Bioloid Premium / GPROBOTIS (South Korea)Was ~$1,000 – $1,500