ATRIAS

A human-height research biped ('Assume The Robot Is A Sphere') with springy, bird-like legs and no upper body, built to test fast and energy-efficient walking. It walked outdoors in April 2015 at a little over 3 mph and was shown at the 2015 DARPA Robotics Challenge.

Price: —Not published
Height: —Not published
Weight: —Not published
Payload: —Not published
Speed: 4.8 km/hFaster than 58%
Battery: —Not published

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Not sure this is the one? Find the best robot for your job Starts with: research and teaching. Five more quick questions.

Why it matters

A tether-free spring-mass biped modelled on running birds whose work led to Agility Robotics' Cassie.

Real-world use

No customers or deployments reported yet.

Timeline

First shown: 2015-03
Released: Not yet

Press coverage ahead of the DARPA Robotics Challenge Finals (earliest dated public source found; lab work began earlier under a four-year, $4.7 million DARPA grant)

Maker

Oregon State University Dynamic Robotics LaboratoryUniversity lab · Corvallis, Oregon, USA

How it stacks up

Against other legged & novel that publish the figure. Pick a measure.

ATRIAS is faster than 58% of the 19 other legged & novel that publish a speed. Bars show the 7 closest in date.

Speed 4.8 km/h 0.1 km/h18.0 km/h #9 of 20 · faster than 58%

Not published by the maker: height, weight, payload, joints, battery, price.

Public attention

A historic robot: no longer sold or in use, so it is not ranked against current machines.

79 views of its Wikipedia article in the last 90 days (ATRIAS)
1 news story from reputable press listed on this page

Measures how much people read and write about a robot, not how good it is. Measured 2026-10-13; same method for every robot. How it is measured

What’s inside

The parts the company has talked about publicly.

Movement: Walks on legs
How it runs: Assisted. Researchers commanded its walking speed while its controller produced stable walking and maintained balance under pushes and impacts.
Actuators & motors: Spring-mass leg design (tether-free, 3D-capable) modelled on running birds

From the maker

ATRIAS is the only machine from Oregon State University Dynamic Robotics Laboratory in the atlas.

Watch ATRIAS

Video: Dynamic Robotics and AI Lab (DRAIL) on YouTube. Plays from youtube-nocookie.com when you press play.

Made, sold and where

Unit counts are usually company figures; analysts often disagree.

Price: Not published
How to get one: No official buying page found
Built: Research robot
Sold or delivered: not sold
Where it is sold or used: Oregon State University, Corvallis

News

The latest 1, newest first. Summaries are ours; tap through for the original.

2015-06-05
ATRIAS live demonstration at the DARPA Robotics Challenge
Oregon State listed an ATRIAS live demonstration at the DARPA Robotics Challenge in Pomona, California, on June 5–6, 2015.
Oregon State University

Sources

Figures come from press coverage. Every link below backs something on this page.

Oregon State University Inspired by humans, a robot takes a walk in the grass Christian Science Monitor Bipedal robot training to become world's fastest mime.engineering.oregonstate.edu ATRIAS: how it is operated

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