Kepler Forerunner K2

Kepler Robotics' full-size bipedal humanoid, built for industrial use with a hybrid actuator design and long runtime.

Forerunner K2 is a humanoid robot from Shanghai-based Kepler Exploration Robot (Kepler Robotics), which launched the commercial K2 “Bumblebee” version in 2025. Published specs: about 175 cm tall, about 75 kg, 52 degrees of freedom across the body, tendon-driven hands with 11 degrees of freedom each, and a roughly 2.33 kWh battery. Its distinguishing feature is a hybrid joint design: planetary-roller-screw linear actuators in the legs and similar joints, with rotary actuators elsewhere. At WAIC (the World Artificial Intelligence Conference) 2025, it ran an 8-hour continuous livestream demo to show off its runtime. Reported production pre-order tiers include a basic bipedal version, a bipedal developer version, and a wheeled developer version, starting at RMB 248,000 (roughly $30,000 overseas), aimed at industrial tasks such as logistics sorting and factory material handling.

ExampleAt the WAIC 2025 booth, K2 Bumblebee runs continuous sorting and grasping demos from 9 a.m. to 5 p.m. to prove out its 8-hour runtime.

Also called

K2 Bumblebee, Bumblebee

Related

Humanoid Robot · Full-size Humanoid Robot · Kepler Robotics · Planetary Roller Screw · Linear Actuator (Electric Cylinder) · Battery Runtime

Sources

Kepler debuts fifth-gen K2 humanoid robot - Interesting Engineering
开普勒K2大黄蜂在WAIC 2025完成8小时续航直播挑战_新浪财经 (Chinese)
商业化落地提速，开普勒K2大黄蜂已开启量产预售 (Chinese)

As of

2025-09