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Athletes Prototype

Cassie

Agility Robotics

“The sprinter of bipedal robotics”

Can stand in for

Locomotion research platform · Bipedal gait testing subject · Agile terrain navigation prototype

Strength 30
Dexterity 5
Autonomy 40
Empathy 5
IQ 45

In the press

If it were human

“Like Usain Bolt distilled into pure legs — a record-breaking specialist who exists solely to redefine what running means.”

Cassie is a bipedal running robot built by Agility Robotics in the United States, first introduced in 2017. She is essentially a pair of dynamic, ostrich-inspired legs — no torso, no arms, no head — engineered from the ground up for one purpose: mastering the art of legged locomotion. Her leg architecture mirrors the spring-loaded, energy-efficient mechanics found in real ostriches, giving her a uniquely fluid and powerful stride.

What Cassie genuinely excels at is running. In 2022 she set a Guinness World Record for the fastest 100 metres run by a bipedal robot, completing the distance in 24.73 seconds. She accelerates, decelerates, and handles dynamic balance in ways that have pushed the boundaries of what researchers thought possible for two-legged machines. She is a cornerstone platform for studying agile dynamic locomotion — every sprint she takes generates invaluable data on balance, control, and energy management.

At the adoption agency, Cassie is our resident track star. She won’t cook your dinner or hold a conversation, but if you need a platform that teaches the world how robots can move — boldly, efficiently, and record-breakingly fast — she is unmatched. She belongs in university labs, robotics research centres, and anywhere that the future of legged mobility is being written. Adopting Cassie means investing in the foundations of every walking and running robot yet to come.

Tech sheet

Creator
Agility Robotics
Year
2017
Country
United States
Type
Bipedal robot
Status
Prototype
Features
  • Bipedal
  • Dynamic locomotion
  • Ostrich-inspired legs
  • No upper body

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Frequently asked questions

What is the Cassie robot?

Cassie is a bipedal robot built by Agility Robotics in the United States, first introduced in 2017. She consists solely of two ostrich-inspired legs — no torso, arms, or head — designed from the ground up to master legged locomotion. Her spring-loaded leg architecture mimics the energy-efficient mechanics of real ostriches, giving her a remarkably fluid and powerful stride.

What can the Cassie robot do?

The Cassie robot specialises in dynamic bipedal running and locomotion research. In 2022, she set a Guinness World Record for the fastest 100 metres run by a bipedal robot, completing the distance in 24.73 seconds. She is capable of accelerating, decelerating, and maintaining dynamic balance, generating valuable data on movement control and energy management with every run.

Who makes the Cassie robot, and when was it created?

The Cassie robot was created by Agility Robotics, a robotics company based in the United States, and was first introduced in 2017. Agility Robotics developed Cassie as a research platform focused on advancing the science of agile, efficient legged locomotion.

What are the key specs of the Cassie robot?

The Cassie robot is a bipedal, ostrich-inspired machine engineered specifically for dynamic running and locomotion research. Official height and weight figures have not been publicly confirmed, so we do not list those specs here. Her most notable measurable achievement is completing 100 metres in 24.73 seconds, a Guinness World Record for bipedal robots.

Who is the Cassie robot best suited for?

The Cassie robot is ideally suited for university laboratories, robotics research centres, and institutions focused on the future of legged mobility. She is a cornerstone research platform rather than a consumer or industrial service robot, making her the right adoption choice for teams studying balance, locomotion control, and energy-efficient movement in machines.