Fourier · research humanoid
N1
Nexus-01
A 1.3 m, 38 kg open-source humanoid with 23 joints (not counting hands) and a swappable back battery good for about two hours. Fourier says it reached 3.5 m/s running in tests (headline figure; the spec table lists 10.8 km/h running), and it was later shown doing cartwheels.
- Price
- —Not published
- Height
- 130 cmTaller than 19%
- Weight
- 38 kgHeavier than 22%
- Payload
- —Not published
- Speed
- 12.6 km/hFaster than 95%
- Battery
- 2 hRuns longer than 15%
Not sure this is the one? Find the best robot for your job Starts with: research and teaching. Five more quick questions.
Why it matters
Fourier's first fully open-source humanoid, released with its bill of materials, drawings, assembly guide and base software.
Real-world use
No customers or deployments reported yet.
Maker
FourierCompany · founded 2015 · Shanghai, ChinaAbout $246M disclosed in total (Sacra): Series D Jan 2022 (SoftBank Vision Fund 2 lead), Series E about 800 million yuan / $109M closed Jan 2025…
How it stacks up
Against other humanoids that publish the figure. Pick a measure.
N1 (Nexus-01) is taller than 19% of the 305 other humanoids that publish a height. Bars show the 7 closest in date.
N1 (Nexus-01) is heavier than 22% of the 277 other humanoids that publish a weight. Bars show the 7 closest in date.
N1 (Nexus-01) is faster than 95% of the 122 other humanoids that publish a speed. Bars show the 7 closest in date.
N1 (Nexus-01) has more joints than 22% of the 236 other humanoids that publish a joints. Bars show the 7 closest in date.
N1 (Nexus-01) runs longer than 15% of the 119 other humanoids that publish a battery. Bars show the 7 closest in date.
Not published by the maker: payload, price.
What it has been shown doing
4 of 14 skills we track, each from a public video or report. Demos can be staged or remote-controlled; we say so when the source does.
- Climb stairsmaker docs state it climbs 20 cm stairs · Apr 2025 · support.fftai.com
- Rough groundmaker docs state it handles 15-20 degree slopes; 1,000+ hours of outdoor testing · Apr 2025 · support.fftai.com
- RunFourier docs state measured max stable running speed of 3.5 m/s (spec table lists 10.8 km/h) · Apr 2025 · support.fftai.com
- Jump & acrobaticsvideo shows N1 doing cartwheels and jumps · Sep 2025 · interestingengineering.com
Not shown yet:SortAssembleFoldKitchenToolsFineGet upCarryOn siteAutonomous
Public attention
A hidden gem: a recent robot with full published specs that gets little attention so far.
- No Wikipedia article of its own yet
- 2 news stories from reputable press listed on this page
Measures how much people read and write about a robot, not how good it is. Measured 2026-10-13; same method for every robot. How it is measured
What’s inside
The parts the company has talked about publicly.
- Hands
- none
- Movement
- Walks on legs · 23 joints
- Chip
- Core i7-13700H (Intel)Core i7-13700H with 16 GB RAM running Ubuntu 22.04.
- Actuators & motors
- Fourier's own FSA 2.0 integrated actuators; 23 DoF (6 per leg, 5 per arm, 1 waist); joint torque limits of 30, 54 or 90 Nm with peak 144 Nm; dual 16-bit/14-bit encoders.
- Sensors & vision
- 6-axis IMU; optional stereo camera in the head.
- Compute
- Intel Core i7-13700H with 16 GB RAM and 512 GB NVMe, running Ubuntu 22.04.
- Battery & power
- Back-mounted, swappable 475 Wh lithium-ion pack (39.6 V) for about 2 hours; about 3.5 hours to charge.
- Materials & build
- Aluminium alloy and engineering plastics.
- AI & software
- Open source: bill of materials, design drawings, assembly instructions and base software on GitHub; teleoperation, reinforcement-learning motion control and MuJoCo simulation resources plus an SDK guide.
- Other details
- 1.3 m, about 38 kg. Ran at 3.5 m/s in Fourier's tests (spec table: 10.8 km/h running, 2.7 km/h walking); later shown doing cartwheels.
Named suppliers:Intel
Lineage
Every Fourier humanoid in order.
Watch N1 (Nexus-01)
Made, sold and where
Unit counts are usually company figures; analysts often disagree.
- Price
- Not published
- How to get one
- No official buying page found
- Where it is sold or used
- Shanghai, China (Fourier)
News
The latest 2, newest first. Summaries are ours; tap through for the original.
- Fourier N1 shown doing cartwheels
Interesting Engineering covered a video of the open-source N1 doing a cartwheel and a 360-degree spin.
Interesting Engineering - Fourier open-sources the N1
Fourier released the N1's bill of materials, drawings, assembly guide and base code as its first open-source humanoid.
AIbase
Side by side with its peers
Picked by the same rules for every humanoid: another maker’s robot that moves the same way, is at the same stage and does at least one of the same main jobs, first shown within two years. Closer size and price rank higher. How we choose
| Measure | N1 (Nexus-01)Fourier |  G1Unitree RoboticsSame jobs: research, education · Both walk · Both on sale or in pilots · Similar size |  Booster T2Booster RoboticsSame jobs: research, education · Both walk · Both on sale or in pilots · Similar size |  Asimov 1Menlo ResearchSame jobs: research, education · Both walk · Both on sale or in pilots · Similar size |
|---|---|---|---|---|
| First shown | 2025-04-11 | 2024-05 | 2026-07-13 | 2026-03 |
| Status | Commercial | Commercial | Commercial | Commercial |
| Height | 130 cm | 132 cm | 140 cm | 120 cm |
| Weight | 38 kg | 35 kg | 42 kg | 35 kg |
| Joints | 23 | 23 | 31 | 25 |
| Speed | 12.6 km/h | 7.2 km/h | 10.8 km/h | — |
| Payload | — | 2 kg | 10 kg | 15 kg |
| Battery | 2 h | 2 h | 2 h | — |
| Price | — | $13,500 | $30,000 | $20,000 |
Sources
Figures come from the maker. Every link below backs something on this page.
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