Humanoid Robot Combat: Steel Blades in San Francisco, a Regulator Steps In

The blades were AR500 hardened steel, 10 to 20 inches long. The organizer moved the photographers back because he worried they would cut through the viewing holes in the cage. One still pierced a camera lens. That was a Friday night in San Francisco in October, at what REK founder Cix Liv billed as “the first humanoid death match.”

A year ago humanoid robot combat meant clumsy kickboxing clips from China. Now it has a permanent arena, a regulator’s cease-and-desist and an engineer whose stated goal is “more damage.” What it still does not have is a robot that fights on its own.

REK: humanoid combat with weapons

REK (Robot Entertainment Kombat) was founded in 2025 and leases a former mattress showroom on Van Ness Avenue as its arena. According to the San Francisco Standard, it fights Chinese-made humanoids that have been modified for combat and are piloted remotely by humans.

• Rektile: 6 ft 2 in, 180 lb, fitted with steel claws.
• T-REK: 190 lb, fitted with Spartan-style blades.
• The crowd: about 100 people, many paying $69 a ticket, during SF Tech Week.

The blades came from Nick Dobrikov, REK’s 24-year-old lead hardware engineer and a former BattleBots engineer. His dream robot, he said, would carry “a giant hydraulic claw on one side and a spinning saw on the other.” The cage panels ended the night gouged and cracked.

The regulator problem

In September 2026, REK staged a human-versus-robot cage match. The California State Athletic Commission responded with a cease-and-desist order over unlicensed combat, the Standard reports. The commission did not respond to the paper’s request for comment.

Liv’s position is that combat sports law covers fights between people. “What we’re doing is not technically illegal,” he said. As long as two robots fight each other, that may hold. Put a human in the cage with a 190 lb machine carrying steel and the regulator’s interest is easy to understand.

This is the first real test of how US athletic commissions treat robot combat, and it will shape what promoters can sell. A sport that cannot legally include a human opponent loses its most marketable format.

From remote control to AI autonomy

Every major humanoid fight format today is human-piloted:

• China’s Mecha Fighting Series (Hangzhou, 2025) put Unitree G1 robots in a kickboxing ring, with humans controlling them in real time.
• Ultimate Fighting Bots assigns teams a Unitree G1 and has pilots drive them in the arena.
• REK uses remote pilots on modified humanoids.

“We’re still a way out from autonomous fighting,” Liv told the Standard. The bottleneck is not punching. It is perception and balance under contact: knowing where an opponent is, predicting a strike and staying upright after taking one.

Where autonomy is happening

Autonomy is arriving faster in sports with clearer rules. At the World Humanoid Robot Games in Beijing in August 2026, organizers required all track and competitive events to be completed fully autonomously. The only exceptions were the 100m and 400m hurdle races. The program included freestyle fighting and martial arts alongside athletics, according to Beijing’s official event preview. Under that rule, freestyle fighting at the Games was meant to be robot against robot with no hand on the controls.

Meanwhile, BattleBots added Orbitron, billed as the world’s first AI-controlled combat robot, to its new Pro League. Our BattleBots Pro League guide has the details.

Humanoid fight formats compared

What a fighting humanoid actually needs

Strip away the blades and a combat humanoid is a balance problem with a hostile input. A walking robot plans for a flat, predictable floor. A fighting robot has to absorb strikes from unpredictable angles and keep its footing on a shifting center of mass. It must also decide in a fraction of a second whether to block, move or counter.

Remote pilots solve the decision part with a human brain, but they add latency. Every millisecond between seeing a punch and reacting to it counts. An autonomous fighter removes the lag and replaces it with a perception problem. It has to track a moving opponent at close range, often with arms and weapons blocking the camera. That is why the first credible autonomous fights are happening in refereed, rules-heavy settings like Beijing, not in a San Francisco cage.

Our view: fascination and caution

Humanoid combat is compelling television and useful engineering. Every fall is test data on balance recovery, every blocked strike a perception problem solved under stress. Dobrikov’s line, “We just want more damage”, is also the reason regulators, insurers and venues will move slowly.

The politics are already in the room. REK backer Hubert Thieblot used the event to argue for a domestic US robotics supply chain. Liv blamed recent US restrictions on foreign-made robots for scaling back REK’s retail plans. Most fighting humanoids today are Chinese-made, and that tension will follow the sport.

Can you bet on humanoid robot combat?

No. No US state-regulated or UK-licensed sportsbook offers markets on humanoid fights. Before that changes, the sport needs consistent rules, a published results history and a way to verify that the pilot or software on fight night is the one advertised.

The broader AI and humanoid theme already trades on regulated prediction markets, which list contracts on technology questions. Trading event contracts involves risk of loss. For the wider field, see our robot combat sports hub.