Bridge vs M1
Zeroth Bridge, Zeroth M1 compared on the things that decide a purchase: price, capability, what actually ships, and estimated costs to your destination.
Delivered price, head to head
Base-machine prices delivered to United States, by the cheapest route on record.
Zeroth
Bridge
$3,999
at Zeroth (OpenBridge store), delivered
Zeroth
M1
$2,499
at Zeroth (direct), delivered
Lowest delivered price
Delivered to United States: the import estimate (machine plus freight, Sales tax (0%), robot duty, and broker), or a seller in your own market where one lists the machine for less. Accessories excluded. Check configuration and request a seller quote on each robot's datasheet.
Compare the details
20 rows, 12 with differences
Scroll within the table to see all details. Model names and row labels stay visible. Unknown specifications remain marked as not published.
| Specification |  Zeroth Bridge |  Zeroth M1 |
|---|---|---|
| Priced configuration | See seller configuration | M1 EDU Combo |
| Listed price | $3,999 | $2,499 |
| Class | Dev / demo | Hobby |
| Who can buy | Consumer | Consumer |
| Status | Preorder | Preorder |
| Capability rating | 2/5 | 2/5 |
| Maturity rating | 3/5 | 3/5 |
| Origin | China | China |
| Size class | Compact | Desktop |
| Height | 88 cm / 2 ft 11 in | 50 cm / 1 ft 8 in |
| Footprint (W x D) | Not published | 12.5 x 19.5 cm |
| Weight | 13 kg | 2.8 kg |
| Degrees of freedom | 21 | 20 |
| Battery (listed) | Not published | 120 min |
| Payload (listed) | Not published | Not published |
| Hands | No hands, none offered | No hands, none offered |
| Out of the box | Per the maker: walking, squatting, lunging, gestures, dances and a backflip from its preloaded motion stack, with three teleoperation modes (a Bluetooth controller, upper-body following in VR, and whole-body teleoperation). No customer unit has shipped outside China, and no independent hands-on review exists yet, so none of this is confirmed. | Per the page, six reference behaviours come pre-loaded (variable-speed walk, walking on rough ground and slopes, one-leg kick, get up after a fall, dance, balance on the cart), the bundled gamepad drives walking and turning with no configuration, and the face display is programmable. No customer unit has shipped, so none of this is independently confirmed. |
| Development access | Open source under GPL-3.0 on GitHub (Zeroth-OpenBridge): the full-body CAD snapshot of 12 Oct 2026 and the electrical topology are public, and the Simulation Hub documents a Python SDK for IMU and motors (MIT, position and speed modes) over ROS 2. The Skill Hub ('Coming soon') and most of the Simulation Hub are still empty, and Zeroth's blog says the SDK and web simulator are a closed beta for its Bridge Builder program. The research paper's project page says code will follow the paper's acceptance. | Python API for high-level behaviours plus the low-latency 'Micro Robot Spine SDK' (the page also calls it the 'M1 Spine SDK') for direct motor commands. ROS 2 is supported 'at the message-bus level'. Policies trained in PyTorch export to ONNX and deploy through what the page calls the 'Reinforced Imitation Framework'; reference workflows are described for Isaac Gym and MuJoCo. Custom models run on a 10 TOPS NPU through the ONNX toolchain. The page markets 'Fully open-source deployment' with 'full source code included', but the linked GitHub repository (ZerothOpenBridge/Zeroth-M1_edu_combo) returned 404 and that organization, created on 13 Oct 2026, had no public repositories on 17 Oct 2026, so the open-source claim cannot be checked yet. |
| Best for | Researchers and developers who want a low-cost, open-hardware biped for whole-body control and motion-imitation work, and who can wait for a first batch whose software is still being published. | Developers and students who want to practise humanoid RL locomotion (sim-to-real) at desk scale and can wait for a first-batch product whose documentation is still being published. |
| Listing checked | 2026-10: sources for Zeroth Bridge | 2026-10: sources for Zeroth M1 |
Listed prices may cover different configurations and tax terms. Use the delivered estimates above for your destination. Battery and payload figures are manufacturer specifications, not results from a shared test.
Bridge
In the box
- Bridge humanoid, 88 cm (21 joints: 4 per arm, 6 per leg, 1 waist)
- 48 V battery pack (capacity not published)
- Charger (12.6 V / 3.2 A input per the spec table)
Not included
- A published box list: the store lists no contents, controller or VR headset
- Cameras or lidar: the maker's GitHub says they are 'not fitted', with interfaces reserved; a depth camera, lidar and a Jetson Xavier NX are described as EDU expansions with no US price
- A ship date, refund policy or warranty
- The SDK and web simulator for everyone: they are a closed beta for Bridge Builder program members
- Shipping, sales tax and import charges (calculated at checkout)
M1
In the box
- M1 humanoid (20 DOF)
- Cart (mobile transport base)
- Remote controller with charging cable
- Power adapter (charging adapter)
- Dual-branch cable (USB data and power)
- User manual and thank-you card
- Custom EPP foam carry case
Not included
- Grippers or articulated hands: none are listed anywhere on the product page (the arms are the 8 joints left after the 12 leg joints)
- A working starter kit: 'm1-starter-kit' and 'reward-functions' are marked 'Coming Soon' and the GitHub repository linked from the page returned 404 on 17 Oct 2026
- Training scripts and reference policies: the FAQ says they are available through the private developer Discord community
- A training computer: the spec sheet lists a minimum of 8 GB GPU VRAM on your own PC
- Shipping, taxes and import charges (calculated at checkout)
- Warranty outside the United States: the 1-year warranty is stated as exclusive to US customers
What the evidence tells you
- Highest capability rating
- Bridge and M1 share 2/5 (tied).
- Highest maturity rating
- Bridge and M1 share 3/5 (tied).
- Lowest listed weight
- M1: 2.8 kg.
Capability and maturity are editorial ratings based on specifications and sales availability. They do not measure reliability, autonomy, or performance on your task. Each datasheet shows the scoring factors.