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Oregon State University · United States

ATRIAS

ATRIAS was a bipedal robot built at Oregon State University's Dynamic Robotics Laboratory under Jonathan Hurst to test the spring mass model of walking and running. It is not a full humanoid but its legs and controllers led directly to Agility Robotics' Cassie and Digit. It walked and ran outdoors and survived kicks and thrown balls.

Retired discontinued Score 20/100, niche Generation 1 Checked 2026-09-04
No written verdict yet

We have not sat down with this one. The score below is computed from the data we hold, and the facts on this page are sourced. It is not on sale, so there is nothing to recommend.

20/100
Niche
Capability 15/30
Value 0/25
Buyability 2/20
Ecosystem 3/15
Proof 0/10
Computed from the data · how the score works

How the score is built

Capability is what the machine physically does. Value compares it with others at a similar price, not with the whole market. Buyability asks whether you can really order one. Ecosystem is the software and community around it. Proof is what it has done in the field, which is where most humanoids score badly and should.

Read the full method

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Status
Retired
Category
research
First revealed
2012
Form
bipedal
Height
n/a
Weight
n/a
Payload
n/a
Degrees of freedom
n/a
Battery
n/a
Runtime
n/a
Walking speed
n/a
Actuation
electric motors with fibreglass leaf springs in series
Units deployed (est.)
not disclosed
Teleoperation
no

Where it stands

Retired after 2015; its spring mass design led to Cassie and Digit at Agility Robotics.

What stands out

  • First robot to match the spring mass gait dynamics of humans
  • Direct ancestor of Cassie and Digit
  • Built for DARPA funded research

Autonomy, observed

Demonstrated walking and running outdoors in 2015 and was the first robot to reproduce human walking dynamics closely

Hands, sensors, brain

  • Hands: none
  • Sensors: joint encoders, IMU
  • Compute: off board and onboard real time computers
  • AI stack: spring loaded inverted pendulum inspired controllers

Price and volume

research prototype

Copies were used at Oregon State, Michigan and Carnegie Mellon

Sources

  1. 01
  2. 02

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