Fourier GR-2 vs Kepler Forerunner K2 "Bumblebee"
Generated from the registry · revision 2026-09-26 · openness out of 100
Fourier GR-2 is 12 kg lighter (63 vs 75 kg) than Kepler Forerunner K2 "Bumblebee". Fourier GR-2 has 1 more degrees of freedom (53 vs 52) and 27 kg less rated payload (3 vs 30 kg) than Kepler Forerunner K2 "Bumblebee". Both list the same height (175 cm). Openness score: Fourier GR-2 30, Kepler Forerunner K2 "Bumblebee" 0 (of 100); only Fourier GR-2 publishes SIM and SW. Availability for both: buy.
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Side by side
■ rows differ| Field | Fourier (Fourier Intelligence)Fourier GR-2 | Kepler Robotics (Shanghai Kepler Exploration Robot Co.)Kepler Forerunner K2 "Bumblebee" | Δ first − second |
|---|---|---|---|
| Identity | |||
| Maker (differs) | Fourier (Fourier Intelligence) | Kepler Robotics (Shanghai Kepler Exploration Robot Co.) | |
| Class | Humanoid | Humanoid | |
| Status | Active | Active | |
| Availability | Buy | Buy | |
| Country | China | China | |
| Year | 2024 | 2024 | |
| Specifications | |||
| Height | 175cm | 175cm | = |
| Mass (differs) | 63kg | 75kg | −12 kg (-16%) |
| Degrees of freedom (differs) | 53 | 52 | +1 (+2%) |
| Payload (differs) | 3kg | 30kg | −27 kg (-90%) |
| Top speed | —unsourced | —unsourced | |
| Runtime (differs) | 120min | 480min | −360 min (-75%) |
| Battery capacity | —unsourced | 2,330Wh | |
| Price | —unsourced | 30,000USD | |
| Actuators (differs) | Fourier FSA 2.0 actuators (>380 N·m peak) | Hybrid roller-screw linear + rotary actuators | |
| Compute | —unsourced | 100 TOPS onboard | |
| Sensors | —unsourced | 80+ integrated sensors; tactile dexterous hands | |
| Openness and provenance | |||
| Openness bar | |||
| Openness score (differs) | 30/ 100 | 0/ 100 | +30 |
| CAD (25) | not public | not public | |
| Bill of materials (20) | not public | not public | |
| Sim model (URDF/MJCF) (20) (differs) | public | not public | |
| Firmware (15) | not public | not public | |
| Software (10) (differs) | public | not public | |
| Trained policies (10) | not public | not public | |
| Verification level (differs) | L1 | L0 | |
| Sources | 2 | 2 | |
| Last checked | 2026-09-24 | 2026-09-24 | |
A dash is an unsourced figure, not zero. Sources for each robot are listed on its spec sheet: Fourier GR-2, Kepler Forerunner K2 "Bumblebee".
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