Astribot S1 vs Kepler K2 Bumblebee

Astribot S1 is a China-built wheeled humanoid upper-body robot with official specs of 170 cm, 80 kg, 5 kg per-arm payload, end-effector speed >=10 m/s, acceleration about 100 m/s^2, repeatability +/-0.1 mm, and 4-6 hours runtime. It uses cable-driven arms and is sold B2B by quote, with no public price. BigGo Finance reports a 15 billion yuan valuation, 10,000-unit S and T production capacity, and customers including Golden Horse, ThunderSoft, JD.com, and Robot MART stores across six Chinese cities. Secondary reviews describe cooking, food prep, cleaning, calligraphy, and other demos, and report Astribot Suite task success rates of 80-100 percent. Autonomy is claimed but not independently audited, S1 has no bipedal walking speed, and no S1-specific deployment output metrics are published

Kepler K2 Bumblebee is a commercial industrial humanoid from Shanghai. It is 175 cm, 75 kg, 52 DoF, with 11-DoF hands, a hybrid roller-screw/rotary actuator design, 100 TOPS compute, and a claimed 30 kg dual-arm payload and 8-hour runtime on a one-hour charge. Kepler lists a $30,000 base price or RMB 248,000 and announced mass production and shipments in September 2025. The most concrete positive evidence is a company-described gait video showing the robot walking over bricks, plastic and grass and remaining stable under pushes. Commercial proof is limited: confirmed orders of over 47 million yuan are reported, and an official video title suggests a Zhaofeng Motor on-the-job log, but 2025 revenue was only 4.34 million yuan with heavy losses and the company was acquired at a lower valuation. Autonomy, endurance and manipulation claims are mostly company statements without independent verification; many demo videos are title-only with no teleoperation disclosure