Overview
The Fourier GR-3 is a 1.64 m, roughly 71 kg humanoid that Fourier Intelligence positions as a “Care-bot”: a companion and interaction platform rather than a factory worker. It is the first Fourier robot with a public English developer documentation centre, opened at support.fftai.com in mid-2026; GR-1 and GR-2 are still listed there as “Coming Soon”. The figures on this page come from that documentation’s robot overview and are the manufacturer’s own.
What are the specifications of Fourier GR-3?
- Height: 1642 mm (see the note on conflicting figures below)
- Footprint: 1642 × 552 × 292 mm
- Arm span: 1395 mm; up to 1759 mm with the optional 12-DOF dexterous hand
- Weight: ≈71 kg
- Payload: ≈3 kg per arm
- Walking speed: 6.1 km/h
- Max walking gradient: 15°
- Actuators: up to 55 (see the note on conflicting figures below)
- Max joint peak torque: 440 N·m
- Battery: 46.8 V nominal; 702 Wh main pack plus 234 Wh sub-pack; ≈3 h runtime; ≈1.5 h to charge
- Compute: AMD Ryzen 7 8845HS
- Sensors: 6-axis IMU, monocular camera, 360° omnidirectional microphone, distributed tactile sensors on head and torso
- Connectivity: Ethernet RJ45, USB 3.0, USB-C, Wi-Fi 6
- Operating temperature: 0–45 °C
Source: Fourier GR-3 robot overview (developer documentation, v3.0.2).
Two figures Fourier publishes twice, differently
Fourier’s own documentation gives two values for two headline numbers. We record both rather than pick one.
- Height: the overview paragraph on the robot overview page says the GR-3 stands 165 cm; the specification table on the same page gives the dimensions as 1642 mm. The site’s landing page also uses 165 cm.
- Degrees of freedom: the specification table says “up to 55” actuators, qualified as including the optional 12-DOF dexterous hands. The GR-Actuator module page describes 31 degrees of freedom for the body: 12 across both legs, 3 in the waist, 2 in the head and 14 across both arms, with the hands excluded. Two 12-DOF hands would bring the total to 55, but Fourier does not state that arithmetic itself.
How much does Fourier GR-3 cost and where can you buy it?
Fourier has not published a price or availability for the GR-3. The developer documentation is the only public source we have found, and it carries neither.
Developer platform
The GR-3 is controlled over DDS through a set of runtime modules Fourier documents individually: a whole-body controller (Aurora), and separate modules for actuators, sensors, dexterous hands, power, media, navigation, manipulation and a motion bank. A Python and C++ SDK, a simulation and training guide, and an exoskeleton teleoperation and data-collection workflow are documented on the same site. Known problems, the four documented navigation fault codes and the fault-code decoding scheme are collected on this robot’s fix page.