On Wednesday 26 August 2026, Tiangong Ultra ran 100 metres in 8.64 seconds in the large-size final at Beijing’s Ice Ribbon and closed the second World Humanoid Robot Games. The Associated Press filed it that afternoon. The Straits Times carried the close at 11:14 p.m. Singapore time. Xinhua’s night wrap, timestamped 22:20 Beijing time, said Team Tianjiao took gold and silver with the winner on 8.64. Global Times put the same clock on the last event of the five-day meet. TSN ran the AP correction that the record is 8.64, not 8.84.
That is 0.22 seconds under Tuesday’s 8.86 semifinal and 0.75 under Saturday’s 9.39 opener — three Games marks in four days, all by the same model from the Beijing Humanoid Robot Innovation Center, also called X-Humanoid. It finished inside Usain Bolt’s 9.58 from Berlin in 2009. Then several machines, including the champion, hit the padded barrier. Sparks came off robots on the ground. Staff brought fire extinguishers. Almost every runner left on a stretcher. We already covered 9.39 and 8.86. This piece is Wednesday’s final, and the stop that still is not a stop.
8.64 is a Games final, not a World Athletics record
Do not treat 8.64 as a like-for-like athletics world record. World Athletics times sit under blocks, a reaction floor, a wind gauge, and a body whose mass is not a design knob. A robotics final puts furniture at the end of the lane because the machine is not expected to brake itself cleanly. The useful delta is Ultra against Ultra: 9.39, then 8.86, then 8.64. Three clocks. One unfinished deceleration.
Xinhua called it a Games record. Global Times noted last year’s best 100 m at these Games was over 12 seconds. Honor’s Lightning reached the final after a half-marathon net of 50:26 in April. Those are event facts. They are not a public height, mass, degrees of freedom, joint torque, payload, or battery figure for the sprint unit. The Innovation Center still has not published those numbers for Ultra. I will not invent them. Event time is not a datasheet.
Faster into the same pad is a harder hit
AP’s finish is the sentence that matters after the clock: several runners, including the champion, crashed into the pad; sparks flew; extinguishers came out; almost all left on stretchers. Xinhua said the robots collapsed one by one and some needed carrying. Same protocol as Saturday and Tuesday: run, clip the time, use the furniture.
A sprint is a periodic, self-loaded gait. The mass is known. The policy was trained on it. The joints that win a final are the ones that can put current into a high-speed reduction and survive foot-strike at that cadence. A stop from that speed flips the sign on the torque. Kinetic energy scales with velocity squared. Going from 8.86 to 8.64 is not a large percentage on the clock, but it is more energy into the same uncontrolled contact if the controller never owned the brake. The pad is still doing the deceleration job.
I do not know what sparked. AP said sparks; staff sprayed machines on the ground. That could be a pack, a harness, a cable, a joint, or impact debris that was never in the thermal model. Nobody published a winding-temperature map, a bus voltage, or a continuous-torque curve for the Wednesday unit. Treat the sparks as an event fact. Do not turn them into a diagnosis.
Jonathan Hurst, a robotics professor at Oregon State University, gave AP the clause that should sit next to every sprint lede: true progress will be measured in warehouses and factories where humanoids work autonomously for hours and generate real economic value. Track conditions are relatively predictable. A closed door, a cart, or a person is not. Wednesday answered the speed half again. It did not answer the stop.
Unitree’s official H1 page lists about 360 N·m at the knee. That is a public spec for a different robot. Ultra’s joints remain unpublished. I am not going to back-calculate a torque from an 8.64 final.
Ultra’s joints stay unpublished. H1’s knee number is not a substitute.
Scenario events still decide whether this is a worker
AP puts the Games at more than 2,000 robots across Olympic-style events and real-world tasks in housework, hotel service, and emergency response. China Daily’s 27 August wrap said 21 of 51 events were scenario-based: medicine sorting, home cleaning, bottle opening, screw driving, tweezer work, cable connects, uneven surfaces, lighting changes. Those are the reviews that matter next to a sprint clock. A machine that needs a crash cushion and a stretcher after a controlled final is not ready to share a floor with a person or a closed door.
FIRGELLI does not make Ultra’s rotary sprint joints, and this is not a claim that we do. Linear actuators belong on the fixtures around a cell — the lift, the locate, the hatch. Nobody at the Ice Ribbon announced one of those on Wednesday. They announced that another two tenths came off a Games clock and that the pad is still the brake. If you are buying a worker, watch who finishes the scenario events without furniture and without a pendant in someone’s hand. The 8.64 is real as a final clock. The sparks, the stretchers, and the unpublished stop are also real.