Agility Robotics has launched Digit 5, a humanoid built to lift 23-kilogram bins onto high shelves and run for 90 minutes on a 9-minute charge. In an essay for IEEE Spectrum, cofounder Jonathan Hurst says the robot is heavy and bulky, and far from the graceful machine he first imagined. The company chose function, safety and certification over elegance, and that choice is the real story.

Why it matters

Humanoid robots are often judged by demo videos of fluid motion. The Digit story points to a different test: whether a machine keeps bins moving shift after shift. According to IEEE Spectrum’s account, customers lose money when bins stop moving, and keeping early deployments running consumed so much effort that it arguably erased any profit. A robot that is merely impressive does not survive that pressure.

The design consequences are concrete. Digit 4 EVT gained larger batteries and system-wide upgrades for safety and regulatory compliance. That added enough mass to change how the robot looked and what it could do. Digit 5 was then designed from scratch around the first 10 use cases the company mapped from real deployments.

Safety is the scaling bottleneck

The most telling detail is about cages. Digit 4 robots had to work behind physical barriers, separated from people, to satisfy insurance and regulatory demands. Hurst admits this seemed silly to him, but says the company has to prove its robots are safe. Digit 5 is meant to work next to human coworkers for 20 hours a day while lifting more than a person can.

Compliance is part of the same work. The essay lists European CE compliance, North American UL electrical-safety certification and Federal Communications Commission limits on electromagnetic radiation as absolute requirements. None of these appear in a research roadmap, yet each gates a sale. For anyone assessing humanoid vendors, certification and insurability may say more about readiness than agility of movement.

The bigger picture

Agility’s path runs from the ATRIAS research biped to Cassie, which sold only 10 units at $250,000 each to research labs, then to Digit with a torso and arms. The company picked warehouse bin handling as a first job because it needs two arms to lift high and legs to move in narrow spaces. It also varies too much between sites for single-purpose automation to cover it. That reasoning answers the question customers kept asking: why legs, and why a humanoid?

Organisational change mattered as much as engineering. Hurst describes hiring an executive team with commercialisation experience and giving up control over product decisions. Many technical founders face this shift, but here it directly reshaped the hardware.

What to watch next

Agility says its 70,000-square-foot RoboFab in Salem, Oregon, can produce more than 10,000 Digit 5 robots per year, and it talks of tens of thousands of humanoid workers. These are capacity and ambition figures, not sales. Signals worth tracking:

  • Whether Digit 5 operates without safety cages in live customer sites.
  • Whether uptime holds up across long shifts, given the 9-minute charge model.
  • Whether the company moves beyond bin handling toward the general-purpose role it describes.
  • Whether the promised grace and elegance return in later versions once the basics are proven.

Digit 5 suggests that commercial humanoids will look more like industrial equipment than science fiction, at least at first. The lesson for the sector is that the hard problems are safety, certification and reliability, and that the elegant robot comes after the useful one.

Sources