K3 Bumblebee vs Walker S2
Humanoid robot spec comparison — Kepler Robotics vs UBTECH.
Kepler Robotics
K3 Bumblebee
79 / 100 Robo2u Score
Successor to the Forerunner K2 with an added waist joint, 30 kg dual-arm lifting and eight-hour shifts
| Spec | K3 Bumblebee | Walker S2 |
|---|---|---|
| Released | 2026-07 | 2025-07 |
| Status | Pilot | Deployed |
| Height | — | 176 cm |
| Payload | 30 kg | 15 kg |
| Degrees of freedom | — | 52 |
| Runtime | 480 min | 120 min |
| Top speed | — | 2 m/s |
| Price | — | — |
| Robo2u Score | 79 | 76 |
Highlighted = better on that spec (lower is better for price and weight; newer for release). The Robo2u Score is a transparent composite — see the Humanoid Showdown for the full field.
