Unitree G1 in the OR: humanoid robot performs world-first live surgery

Surgeons at the University of California San Diego have performed the world's first live-animal surgery using a humanoid robot. A teleoperated Unitree G1 — remotely controlled by a human surgeon — successfully removed the gallbladder from two live pigs. The preclinical trial results were published on July 9, 2026, in Nature.

Key takeaways

Unitree G1 humanoid robot, teleoperated by a surgeon, performed laparoscopic cholecystectomy on live pigs
Study published in Nature (July 9, 2026) — a global first
G1 with functional hands costs approx. $67,000 vs. da Vinci: $500,000 to several million dollars
G1 weighs 60 lbs and stands 5 ft tall — da Vinci weighs roughly 1,800 lbs
System latency: hundreds of milliseconds — safe surgical threshold: below 150 ms

From warehouse to operating room

Unitree G1 was designed for industrial and research use — not for surgery. It carries no medical certification and ships without surgical tools. To make the experiment work, the UC San Diego team built custom physical adapters so the robot could grip laparoscopic instruments. They also wrote new software to map the surgeon's hand movements onto the tools attached to the robot's wrists.

The operating surgeon worked at a control console equipped with a stereo headset display and a foot pedal to engage or disengage hand-to-tool synchronization. The first surgery involved a human assistant standing beside the robot at the table. The second operation deployed two G1 units working together, without anyone standing directly at the patient's side.

Cost versus specialization

The da Vinci Surgical System, FDA-cleared and deployed in thousands of hospitals worldwide, costs between half a million and several million dollars. It weighs roughly 1,800 lbs and demands significant floor space. The Unitree G1 configured with dexterous hands — the version capable of fine manipulation — costs around $67,000. It stands 5 ft tall and weighs just 60 lbs.

It's a fraction of the cost and a fraction of the space in an operating room. It's easy to deploy, anywhere from rural areas, to the battlefield, and even to space.

Shanglei Liu, colorectal surgeon at UC San Diego

Michael Yip, a professor of electrical and computing engineering at UC San Diego, described the longer-term ambition: building an autonomous surgical assistant capable of working alongside human doctors on general tasks.

Limitations of the experiment

The operations took considerably longer than equivalent procedures using specialized surgical systems. The team had to pause multiple times to recalibrate the robot or physically reposition its arm and body. The G1's arm span measures just 450 mm — compared to 1.6 to 1.8 meters for an adult human — which constrained the robot's reach at the table.

The system's latency — the delay between the operator's hand movement and the robot's response — currently runs in the hundreds of milliseconds. Medical literature recommends that surgical robots operate below 150 ms for safe clinical use. Both residents and experienced surgeons completed training tasks faster using da Vinci Research Kit hardware than when controlling the humanoid robot.

Why it matters

Specialized surgical robots require months of installation, major capital investment, and dedicated infrastructure. As a result, robotic surgery remains the privilege of large hospitals in wealthy countries. The UC San Diego study raises a practical question: can affordable, general-purpose humanoid robots fill that gap?

For now, the answer is conditional. The concept is proven — a humanoid robot executed a real surgical procedure on a living animal without the surgeon standing at the table. But the latency, the limited arm reach, and the need for frequent recalibration all point to a long road before human clinical use. This is a preclinical trial, not a market-ready medical device.

Still, the direction is clear. General-purpose robotics is beginning to enter domains historically reserved for highly specialized equipment. The Unitree G1 is not the only humanoid robot being studied in medical contexts — but it is the first to complete an actual surgical procedure on a living organism. That is a meaningful step in the evolution of robots from factory floors toward environments where precision carries life-or-death consequences.

What's next?

The UC San Diego team is continuing to iterate on the system — reducing latency below the 150 ms clinical threshold is the stated primary technical goal
Michael Yip has outlined plans for an autonomous surgical assistant capable of handling general OR tasks (fetching tools, cleaning up) alongside a lead surgeon
Publication in Nature establishes a scientific baseline for further animal trials — a necessary step before any FDA application for human clinical studies