CMU and Siemens test a safety monitor for stopping humanoid robots

What happened

The team used simulation to identify rare conditions that could make a stop unsafe, then Siemens demonstrated the monitor on a commercially available humanoid standing a little over four feet tall. CMU reports that PRISM warned human operators when the robot might be unable to stop safely.

Why it matters

The work addresses a limitation of simply cutting power to a balancing humanoid, which can cause it to collapse. PRISM is currently a human-operator monitor tested in controlled conditions; it is not yet onboard autonomous safety control, a certification standard or an operational deployment.

Source checked October 31, 2026. Status describes the evidence in the linked source at the time of review.