Walker S2 vs Sophia: Specs, Price & ROS Support Compared (2025)
UBTECH Robotics vs Hanson Robotics — independent, side-by-side analysis.
Quick Verdict
Walker S2 leads in higher payload, while Sophia leads in more DOF. The two robots are evenly matched, each excelling in different areas.
Walker S2
UBTECH Robotics
Sophia
Hanson Robotics
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Walker S2 Sophia
Specifications
$90,000PriceContact (R&D version available)
176 cmHeight167 cm
73 kgWeight20 kg
52DOF83
15 kgPayload1.2 kg
—Runtime—
2 m/sSpeed—
YesStairsNo
NoLiDARNo
N/AComputeIntel Core i7, 32 GB RAM
Ecosystem Openness
—
Walker S2
/100
40
Sophia
Hanson AI SDK + OpenCog. Ubuntu. Partial ROS. Niche community.
Pros and cons at a glance
Walker S2
Pros
- Shipping to customers (verified commercial availability)
- 52 degrees of freedom — full-body articulation
Cons
- Closed software stack — no public SDK or ROS support
Sophia
Pros
- Shipping to customers (verified commercial availability)
- 83 degrees of freedom — full-body articulation
Cons
- Unit price not publicly disclosed (quote-on-request or enterprise-only)
- Low rated payload (1.2 kg) — research or light-handling tasks only
- Cannot navigate stairs — restricts deployment environments
Frequently asked questions
How do Walker S2 and Sophia compare on price?
Walker S2: $90,000. Sophia: Contact (R&D version available). Only one of the two has a public unit price; the other publishes a range or enterprise-only terms.
Which has higher payload: Walker S2 or Sophia?
Walker S2 rates a higher payload at 15 kg vs 1.2 kg. Payload ratings are vendor claims and do not always include a duty cycle — peak vs sustained payload can differ significantly.
Are both Walker S2 and Sophia shipping to customers?
Yes. Both are commercially available as of the last review. Delivery timelines and customer geographies vary per vendor — check the manufacturer page for each.
Which is better for ROS-based development: Walker S2 or Sophia?
Walker S2 has no ROS support; Sophia has ROS 1 only. For research and multi-vendor robotics stacks, native ROS 2 is the strongest signal of ecosystem maturity.
Last updated: 2025