Robots Are Coming for Your Medals: Sony's Ace Beats Elite Ping-Pong Players, and a Chinese Robot Shatters the Half Marathon Record

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What happened at the table?

Sony AI has been quietly building Ace since 2020. The project, published on the cover of Nature in April, represents more than five years of convergent work on perception hardware, reinforcement learning, and custom robotics.^[1] The result is an arm-mounted system that tracks a table tennis ball 200 times per second, measures its spin at up to 700 Hz, and reacts with an end-to-end latency of 20.2 milliseconds - roughly eleven times faster than a human player's response time of around 230 milliseconds.^[2]

Ace competed against seven players in Tokyo: five elite-level athletes and two professionals. It won three of the five matches against the elite players and lost both against the professionals - a result the team frames not as a ceiling, but as a baseline. In the months since the paper was written, the robot has continued to improve.^[3]

What makes Ace genuinely interesting is how it wins. Not by brute speed - though it is faster - but through invention. Olympic-level table tennis player Kinjiro Nakamura, who watched Ace compete, was struck by its unorthodox shot selection: "No one else would have been able to do that. I didn't think it was possible."^[1] The robot varied its spin, altered its returns, and consistently placed the ball in ways that disrupted human rhythm. A player who had trained ten thousand hours to read human opponents found himself reading something altogether different.

The engineering behind those shots is layered. Ace uses nine synchronized frame-based cameras alongside three event-based vision sensors - the latter fire only when motion is detected, giving the system the temporal resolution to capture spin at speeds that would blur in conventional footage. Its robotic arm is entirely custom-built; off-the-shelf hardware, the team found, wasn't precise or fast enough for the task. The control policy was trained entirely in simulation using deep reinforcement learning, then transferred to the real robot without additional fine-tuning - a sim-to-real transfer that the researchers describe as one of the project's core technical achievements.^[2]

"Speed in robotics that is not predetermined is one of the last frontiers in robotics. Robots are still slow. It's difficult for them to interact with the environment - let alone with people - at the speed we are accustomed to." - Michael Spranger, President, Sony AI

What happened on the road?

On April 19, in Beijing's E-Town technology district, more than 300 humanoid robots lined up alongside 12,000 human runners for the second annual Humanoid Robot Half Marathon.^[4] The winner, an autonomous robot called Lightning built by Honor - a Chinese company better known for its smartphones - finished the 13.1-mile course in 50 minutes and 26 seconds.

The human world record, set by Ugandan Olympic medalist Jacob Kiplimo in March 2026, is 57 minutes and 20 seconds.^[7] Lightning beat it by nearly seven minutes.

One year earlier, the fastest robot at the same event needed two hours and 40 minutes to finish. That improvement - from 2:40 to 0:50 in a single year - is the number that should give pause. Honor didn't even begin working on humanoid robotics until 2025.^[4] Lightning's design borrows from elite human biomechanics: legs nearly a meter long, an advanced balance system, and a liquid cooling mechanism (adapted from smartphone thermal management) to prevent overheating during sustained exertion. The autonomous version of the robot navigated the course in real time using AI systems that adjusted its pace, maintained balance, and avoided the other robots on the track.

Not every robot had a clean race. Some fell. Several veered off course. Many required technical assistance. Even Lightning fell once - needing its handlers to set it upright before continuing on to victory.^[5] Roughly 40 percent of the field finished - a dramatic improvement over the prior year, when only six robots crossed the line at all.^[6]

Why does any of this matter beyond the spectacle?

Both Sony and the Beijing race organizers have been at pains to say the same thing: the goal was never sport. "Sports are just a proxy for what we want," said Esther Colombini of the University of Campinas, who reviewed the Ace research. The real objective is physical AI that operates fluently in the unpredictable real world - robots that can navigate hospitals, assemble components, assist with disaster response, or simply coexist with people without knocking things over.

The table tennis result is particularly rich in that regard. Ace's architecture - low-latency multi-modal sensing, sim-to-real reinforcement learning, purpose-built hardware - maps almost directly onto the requirements of next-generation industrial and collaborative robots. The half marathon result speaks to a different but equally important dimension: endurance, real-time balance under varying conditions, and the ability to recover from falls without human intervention.

Sony AI's Chief Scientist Peter Stone situated Ace in a lineage that runs from Deep Blue's defeat of Kasparov in 1997, through AlphaGo in 2016, through Sony's own GT Sophy racing AI in 2022. Each milestone moved the goalposts for what "AI mastery" meant. What's different now is the address: not a server farm or a simulated track, but a real table, a real court, a real road in Beijing.^[2]

The question is no longer whether AI can beat humans in physical domains. It's which ones remain, and for how long.

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Discussion

What happened at the table?

What happened on the road?

Why does any of this matter beyond the spectacle?

Sources