South Korean robot RAIBO2 runs full marathon on single battery charge

2026-09-23 15:00 UTC – 2026-09-24 13:49 UTC

Neutral summary

The South Korean quadruped robot RAIBO2, built by engineers at the Korea Advanced Institute of Science and Technology (KAIST), completed a full 42-kilometer marathon in 4 hours, 19 minutes and 52 seconds on a single battery charge. The run took place along rural roads in North Gyeongsang Province, where the machine trotted past orchards and cheering spectators. Its cost of transport, a measure of energy efficiency, was 0.25, beating the human benchmark of 0.37. The developers achieved this through lightweight legs, optimized motor control circuits, and movement rules reinforced by machine learning. The Korea Times notes that this marks the first time Korean robotics research has appeared on the main pages of Nature. According to Handelsblatt, the team hopes RAIBO2 could be used for patrols, while El Mundo reports potential applications in rescuing survivors of disasters. The Register adds that the paper was published two years after the run itself.

How it was framed

Outlets: 12. Countries: 8. Facts in the shared core: 4.

Publication timeline

2026-09-23 00:00 · Nature (outlet profile)
A quadruped robot designed to complete a marathon on a single battery charge. Nature, Published online: 23 September 2026; doi:10.1038/s41586-026-11102-5 RAIBO2, an energy-efficient quadruped robot, completed a full mar…
2026-09-23 15:00 · Scientific American (outlet profile)
Watch a robot dog run a marathon faster than the average human. The quadrupedal machine finished the course in a solid four hours, 19 minutes and 52 seconds—and on just one battery charge
2026-09-23 15:00 · El Mundo (outlet profile)
RAIBO2, el robot que recorre los 42 kilómetros de un maratón sin recargar la batería. Se llama RAIBO2 y ha demostrado que puede recorrer decenas de kilómetros durante ocho horas seguidas. Sus creadores quieren superar u…
2026-09-23 15:00 · RTVI.com (outlet profile)
Четвероногий робот обошел человека и «собратьев» на марафонской дистанции. Южнокорейский четвероногий робот преодолел на одном заряде батареи марафонскую дистанцию благодаря усовершенствованиям, повысившим его выносливо…
2026-09-23 15:12 · The Korea Times (outlet profile)
4-legged Korean robot runs full marathon on single charge. In the world of legged robotics, endurance has long been the ultimate hurdle. While four-legged machines can backflip, negotiate rubble and scale staircases wit…
2026-09-23 15:12 · Spektrum (outlet profile)
4 Stunden und 19 Minuten: Erstmals läuft ein Roboter einen Marathon. Ein vierbeiniger Roboter ist 42 Kilometer weit gelaufen und hatte im Ziel sogar noch Energie übrig. Ein neuer Rekord. Möglich machen das enorme Fortsc…
2026-09-23 16:02 · ТАСС (outlet profile)
В Корее создали робота, превосходящего человека в эффективности бега. Эти машины тратят энергию не только на передвижение, но и на поддержание баланса тела и перемены в положении и форме шарниров и сочленений, что сущес…
2026-09-23 16:33 · The Register (outlet profile)
Robot dog ran a marathon on one charge and lived to publish the paper. Two years later, creators explain how lightweight hardware and reinforcement learning helped it go the distance
2026-09-24 01:17 · The Korea Times (outlet profile)
Korean quadruped robot's marathon triumph featured in Nature. In the world of legged robotics, endurance has long been the ultimate hurdle. While four-legged machines can backflip, negotiate rubble and scale staircases…
2026-09-24 02:00 · Handelsblatt (outlet profile)
Energieeffiziente Technik: Roboter in Südkorea läuft Marathon unter viereinhalb Stunden. Passable Zeit und nur eine Batterieladung: Umgeben von menschlichen Läufern hat ein vierbeiniger Roboter einen Marathon gemeistert…
2026-09-24 04:00 · La Vanguardia (outlet profile)
Un robot corre la maratón, con una sola batería, en 4 horas y 19 minutos
2026-09-24 13:01 · Antara (English) (outlet profile)
Twenty Years of the Qinghai-Xizang Railway: A Path Toward Harmony Between People and Nature. 2026 marks the 20th anniversary of the opening of the Qinghai-Xizang Railway. Spanning nearly 2,000 kilometers ...
2026-09-24 13:49 · El Nacional (outlet profile)
Robot cuadrúpedo corrió un maratón en 4 horas y 19 minutos. El modelo RAIBO2 se diseñó para abordar los aspectos relacionados con la pérdida de energía, lo que incluye patas ligeras, circuitos de control de motores más…

Factual core

A robot completed a marathon in 4 hours and 19 minutes on a single battery charge.
RAIBO2 finished the marathon in over four hours.
The robot's performance was made possible by major advances in hardware and software.
The robot ran a distance of 42 kilometers.

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