Quick Answer
HRP-4 is the slimmer Kawada / HRP research humanoid — about 151 cm and 39 kg, 34 DOF, with a reported 0.9 kg load per horizontally extended arm. A historical launch figure of JPY 26,000,000 has been repeated; treat it as a period price, not a live quote. This is a lab biped, not a 2026 hire.
Our Verdict
| Field | Rating | Notes |
|---|---|---|
| Overall Review Score | 5.4 / 10 | As a current purchase. 6.5 as a documented HRP platform. |
| Research usefulness | 6.5 / 10 | OpenHRP / OpenRTM-era platform notes exist. |
| Commercial readiness | 1.0 / 10 | Research platform. Not a current store SKU we can verify. |
| Consumer readiness | 0 / 10 | |
| Autonomy confidence | Research / teleop-capable era | |
| Best for | HRP family context next to HRP-5P | |
| Biggest concern | Repeating a 26 million yen number as if you can order it Monday |
What it is
A lighter full-size-looking research biped in the HRP line, built to work in human environments at lower mass than HRP-5P.
What is published
HRP comparison tables, OpenHRP/OpenRTM-style notes, and that JPY 26,000,000 launch figure on our profile. No commercial SDK we treat as current.
Flaws
0.9 kg per outstretched arm is a research limit, not a tool-use promise. The template still dumped Optimus into the compare list.
Real-world usefulness
Historical and lab-lineage value. If you want the construction-board story, that is HRP-5P. If you want a living Japanese maker story, it is not this SKU.
Full specs and images
HRP-4 profile · HRP-5P review · All humanoid reviews.
FAQ
Is HRP-4 the same as HRP-5P?
No. 5P is heavier and aimed at construction-style tasks in the papers.
Can I buy HRP-4?
Not as a current commercial product we can point at.
Who made it?
Kawada Robotics in the HRP program.
Sources
HRP-4 public comparison notes and the firgellirobots profile.