Overview
RT Corporation, a Tokyo robotics company, announced Mujina in November 2025 and first showed it at the International Robot Exhibition 2025 at Tokyo Big Sight (December 3–6). It is a research and development model for light-duty patrol, inspection and surveying work. RT calls it a technology test unit, not a durable production model. It is the first step in a project to build Japanese quadrupeds for power plants, telecom sites, large factories and construction surveying, so that inspection data stays in Japan. RT plans large, medium and small industrial models after it, with no dates given. RT is also developing Japan-made high-torque motors for the series, with test use expected in one to two years. RT's December 2024 plan was to productize MEVIUS, a quadruped from Kento Kawaharazuka's lab at the University of Tokyo. RT has not said whether Mujina is based on it (unconfirmed). RT has not published weight, speed or other specs.
- Type
- Quadruped robot · Developer-grade
- Maker
- RT Corporation (Japan)
- Released
- 2025
- Price
- Quote only
- Status
- Available
- Best for
- Professionals & labs
- Programming
- Open source (hardware + software)
Price and shipping
Built to order, with pricing by inquiry to RT's sales team. RT's December 2024 announcement of the project gave a target price of several million yen for the robot alone, roughly $13,000 – $65,000 (estimate).
Shipping: Built to order. Built to order since the International Robot Exhibition in December 2025. Orders and quotes go through RT's sales team in Tokyo. No reseller outside Japan was found. RT Corporation ↗
Specifications
| Category | Quadrupeds · Developer-grade |
|---|---|
| Released | 2025 |
| Country | Japan |
| Availability | Available |
| Programmability | Open source (hardware + software) |
| Built-in autonomy | None / scripted · Moves only when controlled, or plays preset motions |
| LLM support | None · No built-in LLM. It runs on ROS 2, so a developer could connect one (unconfirmed). |
| MuJoCo simulation | None found · Nothing found. |
| NVIDIA Isaac simulation | None found · Nothing found. |
| Gazebo simulation | None found · Nothing found. |
| Best for | Professionals & labs |
| Vision sensors | Unknown |
| Actuators | Unknown |
| Audio | No audio |
| Compute type | Unknown |
| Compute | Not published |
| Weight | Not published |
| Speed | Not published |
| DOF | Not published (likely 12, 3 per leg, judging from photos) (unconfirmed) |
| Sensors | Not published |
| SDK | ROS 2, with open hardware that developers can modify |
Common questions
How much does Mujina cost?
Quote only. Built to order, with pricing by inquiry to RT's sales team. RT's December 2024 announcement of the project gave a target price of several million yen for the robot alone, roughly $13,000 – $65,000 (estimate).
Can Mujina be bought today?
Yes, it is on sale. Built to order since the International Robot Exhibition in December 2025. Orders and quotes go through RT's sales team in Tokyo. No reseller outside Japan was found.
Who makes Mujina?
Mujina is made by RT Corporation (Japan). It came out in 2025.
Can Mujina be programmed?
Open source (hardware + software). ROS 2, with open hardware that developers can modify.
Does Mujina have AI chat or LLM support?
None. No built-in LLM. It runs on ROS 2, so a developer could connect one (unconfirmed).
Ratings & reviews
Ratings and reviews load on the live site.
Related guides
- Fastest Robot Dogs · the top 20 ranked by speed
- Robot Dog Actuators · how to choose the leg motors
- 8 vs 12 DOF Robot Dogs · two or three motors per leg
- Robot Gaits and Gait Training · how legged robots walk, trot and gallop
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Image credits
- Image 1: source (RT Corporation press image)