Agility Robotics, a company founded in 2015 to develop humanoid robots, has launched Digit 5. The robot is engineered to perform physically demanding warehouse tasks, such as lifting 23-kilogram bins onto high shelves. It features a battery system capable of running for 90 minutes on a 9-minute charge, aiming to fill labor needs in roles that are repetitive or physically taxing for humans. While previous iterations focused on the physics of movement, Digit 5 is designed for economic viability and safety at scale.
The development of Digit 5 represents a significant departure from the original research goals of its co-founder, Jonathan Hurst. Early projects like ATRIAS and Cassie were designed to explore the 'spring-mass' model of locomotion, prioritizing fluid, natural motion. Cassie, in particular, was a research platform that used reinforcement learning—where a simulated robot learns through trial and error—to achieve dynamic behaviors like running and climbing stairs. However, transitioning from a research lab to a commercial product required prioritizing customer needs over aesthetic elegance. This shift led to the inclusion of a torso and arms for mobile manipulation, eventually resulting in the current iteration of the Digit series.
Digit 5 is notably heavier and bulkier than its predecessors, a result of 'ruthless triage' during the design process. To meet commercial requirements, the robot underwent major upgrades for safety and regulatory compliance, including larger batteries and system-wide modifications. These changes altered the robot's appearance, sacrificing the lithe, graceful motion Hurst originally envisioned in favor of brutal functionality. While the robot is now capable of performing industrial work, the trade-off remains a tension between the scientific ideal of graceful humanoid motion and the practical necessity of a reliable, safe, and economically viable warehouse worker. The current design ensures the robot can operate in narrow spaces and handle heavy loads, even if it lacks the aesthetic fluidity of earlier research prototypes.
The image illustrates the physical scale and industrial design of the Digit 5 robot described by its co-founder.