Robonaut 2 vs Walker S2
Side-by-side comparison of Robonaut 2 (NASA Johnson Space Center and GM) and Walker S2 (UBTECH Robotics Corp Ltd.) — specs, pricing, Robo Index, and verified deployments. Updated daily.
Optimize comparison for buyer
Optimized for Home & Household buyers. Priority specs lifted to the top and marked with a target.
Layer 1: Identity & Trust
Manufacturer Country
- Robonaut 2United States
- Walker S2China
Year First Available
- Robonaut 22010
- Walker S22025
Verified Deployments
- Robonaut 20 Deployments
- Walker S20 Deployments
Layer 2: Operational
Price
- Robonaut 2Research platform
- Walker S2$99,995–$314,286 USD
Battery / Shift Runtime
- Robonaut 2—
- Walker S22 hrs
Availability Status
- Robonaut 2ACTIVE
- Walker S2ACTIVE
Physical Form Factor
Weight
- Robonaut 2149.7 kg
- Walker S295 kg
Height
- Robonaut 2101.6 mm
- Walker S2176 mm
Mobility Type
- Robonaut 2bipedal
- Walker S2bipedal
Humanoid Subtype
- Robonaut 2full bipedal
- Walker S2full bipedal
Walking Speed
- Robonaut 2—
- Walker S22 m/s
Stair Climbing
- Robonaut 2No
- Walker S2Yes
Terrain
- Robonaut 2zero gravity
- Walker S2flat indoor, stairs
Payload & Dexterity
Payload
- Robonaut 29 kg
- Walker S252 kg
Total DOF
- Robonaut 242
- Walker S252
Arm DOF
- Robonaut 27
- Walker S27
Hand DOF
- Robonaut 212
- Walker S27
Bimanual Coordination
- Robonaut 2Yes
- Walker S2Yes
Compute & AI
Onboard Compute
- Robonaut 238 PowerPC processors
- Walker S2X86 + NVIDIA Jetson Orin
VLM Capable
- Robonaut 2No
- Walker S2No
Foundation Models
- Robonaut 2false
- Walker S2false
Imitation Learning
- Robonaut 2No
- Walker S2No
Programming
- Robonaut 2teleoperated
- Walker S2code_ros
Battery & Power
Runtime
- Robonaut 2—
- Walker S22 hrs
Battery Swap
- Robonaut 2No
- Walker S2Yes
Software
SDK Languages
- Robonaut 2teleoperated
- Walker S2Python
ROS Support
- Robonaut 2No
- Walker S2Yes
Open API
- Robonaut 2No
- Walker S2Yes
Reliability
Deployment Maturity
- Robonaut 2commercial
- Walker S2commercial
Commercial
Price (USD)
- Robonaut 2Research platform
- Walker S2$99,995–$314,286 USD
Price Tier
- Robonaut 2—
- Walker S280-150K
Pricing Model
- Robonaut 2outright purchase
- Walker S2purchase
Applications
- Robonaut 2space_exploration, automotive_manufacturing, hazardous_env, medical_assistance
- Walker S2industrial automation, 24/7 manufacturing
| ||
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | United States | China |
| Year First Available (values differ) | 2010 | 2025 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | Research platform | $99,995–$314,286 USD |
| Battery / Shift Runtime (priority for Home & Household buyers) (values differ) | — | 2 hrs |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Physical Form Factor | ||
| Weight (priority for Home & Household buyers) (values differ) | 149.7 kg | 95 kg |
| Height (values differ) | 101.6 mm | 176 mm |
| Mobility Type | bipedal | bipedal |
| Humanoid Subtype | full bipedal | full bipedal |
| Walking Speed (values differ) | — | 2 m/s |
| Stair Climbing (values differ) | No | Yes |
| Terrain (values differ) | zero gravity | flat indoor, stairs |
| Payload & Dexterity | ||
| Payload (values differ) | 9 kg | 52 kg |
| Total DOF (values differ) | 42 | 52 |
| Arm DOF | 7 | 7 |
| Hand DOF (values differ) | 12 | 7 |
| Bimanual Coordination | Yes | Yes |
| Compute & AI | ||
| Onboard Compute (values differ) | 38 PowerPC processors | X86 + NVIDIA Jetson Orin |
| VLM Capable | No | No |
| Foundation Models | false | false |
| Imitation Learning | No | No |
| Programming (values differ) | teleoperated | code_ros |
| Battery & Power | ||
| Runtime (values differ) | — | 2 hrs |
| Battery Swap (values differ) | No | Yes |
| Software | ||
| SDK Languages (values differ) | teleoperated | Python |
| ROS Support (values differ) | No | Yes |
| Open API (values differ) | No | Yes |
| Reliability | ||
| Deployment Maturity | commercial | commercial |
| Commercial | ||
| Price (USD) (values differ) | Research platform | $99,995–$314,286 USD |
| Price Tier (values differ) | — | 80-150K |
| Pricing Model (values differ) | outright purchase | purchase |
| Applications (values differ) | space_exploration, automotive_manufacturing, hazardous_env, medical_assistance | industrial automation, 24/7 manufacturing |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Running Capable, Payload (Peak), Arm Reach, Grip Strength, Manipulation Repeatability, Tool Use, Compute Platform, Teleoperation, Battery Capacity, Charging Time, Charging Method, Avg Power Consumption, Force-Limited Arms, Fall Recovery, Fall Detection Response, Emergency Stops, Human Detection Method, Safe Speed Near Humans, Simulation Platforms, Air-Gap Capable, MTBF, Task Success Rate, IP Rating, Noise Level, RaaS / Month, Developer Unit Price, Delivery Lead Time, Warranty, Production Pilots
ROI Comparison
Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.
Annual labor displaced (per robot): $50,000
| Metric | Robonaut 2 | Walker S2 |
|---|---|---|
| Investment | No price | $207,140 |
| Payback period | — | 49.7 mo |
| Net savings (5 yr) | — | $42,860 |
| ROI (5 yr) | — | +21% |
Robonaut 2 has no listed price, so payback can't be computed. Contact the manufacturer for a quote.
Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.
Trade-offs at a glance
Frequently asked
Who makes Robonaut 2 and Walker S2?
Robonaut 2 is made by NASA Johnson Space Center and GM, based in US. Walker S2 is made by UBTECH Robotics Corp Ltd., based in CN.
When were Robonaut 2 and Walker S2 launched?
Robonaut 2 launched in 2010. Walker S2 launched in 2025.
How do Robonaut 2 and Walker S2 compare on the Robo Index?
Robonaut 2 grades BB on the Robo Index. Walker S2 grades AA. The Robo Index is a credibility grade (AAA … C) that blends commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
What is the payload difference between Robonaut 2 and Walker S2?
Robonaut 2 carries up to 9 kg. Walker S2 carries up to 15 kg.
Are Robonaut 2 and Walker S2 in the same category?
Both robots are classified as Humanoid on Robolist. Filters and ranking treat them as direct alternatives.
What is the realistic total cost of ownership for Humanoid robots?
Hardware cost is one input. Humanoid TCO also includes integration, training, downtime, and end-of-life. Our breakdown: Humanoid TCO: Hardware, Cloud Subscriptions, and the Cost of Teleop Time.
What should a buyer ask vendors when choosing between Robonaut 2 and Walker S2?
Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Vendor Selection for Humanoids: The 10 Questions You Must Ask.
Going deeper — picking the right robot
Humanoid TCO: Hardware, Cloud Subscriptions, and the Cost of Teleop Time
8 min readHumanoid Robots
Vendor Selection for Humanoids: The 10 Questions You Must Ask
10 min readHumanoid Robots
Running a Humanoid Pilot: Scope, Success Criteria, and Exit Options
9 min readHumanoid Robots
Build vs buy vs lease: which model fits a first deployment
8 min readChoosing Your First Robot
The hidden specs vendors hope you'll miss
10 min readReading the Spec Sheet
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About this comparison
Robonaut 2 vs Walker S2 compares two robots in the humanoid category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Index is calculated.