Cassie Height and Core Physical Specifications
Cassie stands approximately 1.5 meters tall, or about 4 feet 11 inches, with a lightweight carbon-fiber and 3D-printed polymer frame engineered for dynamic balance and efficient locomotion. The robot was developed by Agility Robotics, a spin-out from Oregon State University, and later supported by funding from the Defense Advanced Research Projects Agency (DARPA) and commercial partners looking to advance legged automation for logistics and industrial settings read more on Forbes.
The compact Cassie height allows it to navigate spaces designed for humans, including staircases, narrow aisles, and uneven outdoor terrain, while keeping the center of mass low for stability. Its actuated ankle joints and series-elastic knee design provide compliant ground interaction, enabling running gaits, turning on the spot, and recovery from external pushes details from Agility Robotics.
Design Rationale Behind Cassie Height and Kinematics
Engineers chose Cassie height to match the human-scale environment without the complexity and weight of a full torso, arms, or a head, focusing instead on lower-body mobility and payload capacity. The robot uses a planar, bird-like leg geometry with two actuated joints per leg and passive compliance, which simplifies control while still achieving dynamic behaviors like jumping and stair climbing read more on MIT Technology Review.
By keeping the structure close to the ground, Cassie height reduces the moment of inertia during fast direction changes and lowers the risk of tipping during aggressive maneuvers. This design philosophy aligns with the company's goal of creating a practical, cost-effective platform for warehouse and campus delivery tasks, where reliability and ease of integration matter more than anthropomorphic appearance SEC filings and company disclosures.
Real-World Deployments and Performance Metrics
In field tests, Cassie has demonstrated autonomous navigation through structured and semi-structured environments, using onboard perception to map surroundings and plan footsteps that respect its physical limits. Cassie height, combined with its low mass, enables it to traverse gaps, curbs, and debris while carrying moderate payloads for last-mile delivery and facility inspection scenarios Forbes coverage.
Performance benchmarks highlight Cassie's ability to maintain balance on slopes and irregular surfaces, with control algorithms tuned for the specific kinematics implied by its height and leg geometry. These trials have informed iterative design updates, including improved joint torque density and battery endurance, positioning Cassie as a reference platform for studying efficient legged locomotion in real-world logistics and defense-adjacent applications Agility Robotics technical overview.