ENGINEAI SA01 Bipedal Humanoid Robot

A robot designed to explore walking

The ENGINEAI SA01 is a bipedal robotics platform developed primarily for research, education and experimentation. Unlike traditional full-body humanoid robots, it focuses on the lower half of the body, with two articulated legs and a compact upper structure rather than robotic arms and hands.

Each leg has six degrees of freedom, giving the robot 12 in total. These joints allow developers to experiment with walking, balance and different movement strategies. ENGINEAI's proprietary S160 motors provide powerful actuation, with maximum knee-joint torque reaching 160 N·m and ankle-joint torque reaching 96 N·m.

One of the SA01's most interesting features is its straight-knee walking capability. Rather than relying entirely on the bent-knee movements often seen in robotic locomotion, ENGINEAI developed motion-control technology that supports a more natural walking posture.

The company has also highlighted the robot's ability to stand on one leg and its potential for running and jumping movements. Together, these features make the SA01 an interesting platform for exploring how robots maintain balance, coordinate their joints and move on two legs.

Open development and customisation

A major attraction of the SA01 is its open development approach. ENGINEAI designed the platform to give researchers and developers more freedom to experiment with robotic movement, rather than limiting them to a fixed set of pre-programmed behaviours.

ENGINEAI has published locomotion-development resources through its GitHub repositories. These include an NVIDIA Isaac Gym-based reinforcement learning environment, robot models and tools for transferring trained locomotion policies from simulation to real hardware.

This is particularly useful for researchers who want to develop their own walking algorithms. For example, a developer can train a locomotion policy in simulation, evaluate how it responds to different conditions and then prepare the trained model for deployment on an SA01.

The manufacturer's control software also documents joystick operation, standing modes and reinforcement-learning locomotion control. This provides a starting point for developers interested in custom motion-control experiments.

Beyond software, the SA01's modular design supports physical customisation. ENGINEAI has described the possibility of adding robotic arms and other modules, allowing the platform to serve as the foundation for more specialised robots. However, such capabilities require additional hardware and development rather than being standard SA01 functions.

Applications, accessibility and development

The SA01 was introduced in July 2024 as a lower-cost platform for robotics research and education. ENGINEAI initially announced it at RMB 38,500, positioning it as a more accessible way for institutions and individual developers to work with professional bipedal robotics hardware.

By December 2024, ENGINEAI reported that the SA01 EDU had entered batch deliveries. The company subsequently exhibited it alongside the SE01 and PM01 at CES 2025, demonstrating how the platform fitted into its growing robotics lineup.

The SA01 is particularly relevant to university laboratories, robotics courses and research teams investigating motion control, balance and reinforcement learning. Its open software resources provide a practical way to connect theoretical robotics research with experiments on real hardware.

Its aluminium alloy construction and replaceable battery also support repeated testing and development work. ENGINEAI has described maintaining replacement parts for existing customers, which is useful for research environments where experimental hardware may experience wear or damage.

As of October 2026, the SA01 remains listed on ENGINEAI's official purchase website for RMB 42,000. While its modular architecture creates opportunities for further applications, its strongest established role is as a platform for developing and studying bipedal robot movement.

How does the SA01 differ from other ENGINEAI humanoids

The ENGINEAI SA01 stands apart from the company's other humanoid robots by focusing on bipedal locomotion and open-source development rather than providing a complete humanoid body. Compared with the PM01, which includes articulated arms and supports more complex whole-body movements, the SA01 offers a simpler platform for studying walking, balance, and motion control. The larger SE01 places greater emphasis on natural human-like walking in a full-size humanoid design, while the more powerful T800 is aimed at demanding industrial and commercial applications. ENGINEAI's S2 is particularly interesting because it builds on the SA01's bipedal architecture by adding an upper body and interactive features. Overall, the SA01 is best suited to researchers, educators, and developers who want to experiment with the fundamentals of legged robotics and develop their own robotic systems.