Mercury X1 vs RoboThespian 3
Side-by-side comparison of Mercury X1 (Elephant Robotics) and RoboThespian 3 (Engineered Arts) — specs, pricing, Robo Score, and verified deployments. Updated daily.
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Layer 1: Identity & Trust
Manufacturer Country
- Mercury X1China
- RoboThespian 3United Kingdom
Year First Available
- Mercury X12023
- RoboThespian 32016
Verified Deployments
- Mercury X10 Deployments
- RoboThespian 30 Deployments
Layer 2: Operational
Price
- Mercury X1$15,999 USD
- RoboThespian 3Contact for quote
Battery / Shift Runtime
- Mercury X18 hrs
- RoboThespian 3—
Availability Status
- Mercury X1ACTIVE
- RoboThespian 3ACTIVE
Physical Form Factor
Height
- Mercury X1118 mm
- RoboThespian 3175 mm
Weight
- Mercury X155 kg
- RoboThespian 333 kg
Mobility Type
- Mercury X1bipedal
- RoboThespian 3bipedal
Humanoid Subtype
- Mercury X1full bipedal
- RoboThespian 3full bipedal
Walking Speed
- Mercury X11.2 m/s
- RoboThespian 3—
Stair Climbing
- Mercury X1Yes
- RoboThespian 3No
Terrain
- Mercury X1flat indoor, uneven outdoor
- RoboThespian 3flat indoor
Payload & Dexterity
Payload
- Mercury X11 kg
- RoboThespian 3—
Total DOF
- Mercury X119
- RoboThespian 326
Arm DOF
- Mercury X19.5
- RoboThespian 3—
Arm Reach
- Mercury X145 cm
- RoboThespian 3—
Manipulation Repeatability
- Mercury X1±0.05 mm
- RoboThespian 3—
Bimanual Coordination
- Mercury X1No
- RoboThespian 3No
Compute & AI
Onboard Compute
- Mercury X167 TOPS
- RoboThespian 3Intel dual-core CPU, multiple Marvell and Parallax microcontrollers, external Intel Core i7 control unit
Compute Platform
- Mercury X1Jetson Orin Nano SUPER 8GB
- RoboThespian 3—
VLM Capable
- Mercury X1No
- RoboThespian 3No
Foundation Models
- Mercury X1false
- RoboThespian 3—
Imitation Learning
- Mercury X1No
- RoboThespian 3No
Programming
- Mercury X1CAN Bus/WIFI/Network port/Bluetooth/USB serial port
- RoboThespian 3Python scripting and API support
Battery & Power
Runtime
- Mercury X18 hrs
- RoboThespian 3—
Battery Swap
- Mercury X1No
- RoboThespian 3No
Software
SDK Languages
- Mercury X1Python, ROS1, ROS2
- RoboThespian 3Python
ROS Support
- Mercury X1No
- RoboThespian 3No
Open API
- Mercury X1No
- RoboThespian 3Yes
Reliability
Deployment Maturity
- Mercury X1commercial
- RoboThespian 3commercial
Commercial
Price (USD)
- Mercury X1$15,999 USD
- RoboThespian 3Contact for quote
Price Tier
- Mercury X140-80K
- RoboThespian 3—
Warranty
- Mercury X1—
- RoboThespian 31 yrs
Applications
- Mercury X1robotics research and development, human-robot interaction research
- RoboThespian 3entertainment, education
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | China | United Kingdom |
| Year First Available (values differ) | 2023 | 2016 |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | $15,999 USD | Contact for quote |
| Battery / Shift Runtime (values differ) | 8 hrs | — |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Physical Form Factor | ||
| Height (values differ) | 118 mm | 175 mm |
| Weight (values differ) | 55 kg | 33 kg |
| Mobility Type | bipedal | bipedal |
| Humanoid Subtype | full bipedal | full bipedal |
| Walking Speed (values differ) | 1.2 m/s | — |
| Stair Climbing (values differ) | Yes | No |
| Terrain (values differ) | flat indoor, uneven outdoor | flat indoor |
| Payload & Dexterity | ||
| Payload (values differ) | 1 kg | — |
| Total DOF (values differ) | 19 | 26 |
| Arm DOF (values differ) | 9.5 | — |
| Arm Reach (values differ) | 45 cm | — |
| Manipulation Repeatability (values differ) | ±0.05 mm | — |
| Bimanual Coordination | No | No |
| Compute & AI | ||
| Onboard Compute (values differ) | 67 TOPS | Intel dual-core CPU, multiple Marvell and Parallax microcontrollers, external Intel Core i7 control unit |
| Compute Platform (values differ) | Jetson Orin Nano SUPER 8GB | — |
| VLM Capable | No | No |
| Foundation Models (values differ) | false | — |
| Imitation Learning | No | No |
| Programming (values differ) | CAN Bus/WIFI/Network port/Bluetooth/USB serial port | Python scripting and API support |
| Battery & Power | ||
| Runtime (values differ) | 8 hrs | — |
| Battery Swap | No | No |
| Software | ||
| SDK Languages (values differ) | Python, ROS1, ROS2 | Python |
| ROS Support | No | No |
| Open API (values differ) | No | Yes |
| Reliability | ||
| Deployment Maturity | commercial | commercial |
| Commercial | ||
| Price (USD) (values differ) | $15,999 USD | Contact for quote |
| Price Tier (values differ) | 40-80K | — |
| Warranty (values differ) | — | 1 yrs |
| Applications (values differ) | robotics research and development, human-robot interaction research | entertainment, education |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Running Capable, Payload (Peak), Hand DOF, Grip Strength, Tool Use, 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, Pricing Model, Developer Unit Price, Delivery Lead Time, 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 | Mercury X1 | RoboThespian 3 |
|---|---|---|
| Investment | $15,999 | No price |
| Payback period | 3.8 mo | — |
| Net savings (5 yr) | $234,001 | — |
| ROI (5 yr) | +1463% | — |
RoboThespian 3 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 Mercury X1 and RoboThespian 3?
Mercury X1 is made by Elephant Robotics, based in CN. RoboThespian 3 is made by Engineered Arts, based in GB.
When were Mercury X1 and RoboThespian 3 launched?
Mercury X1 launched in 2023. RoboThespian 3 launched in 2016.
How do Mercury X1 and RoboThespian 3 compare on the Robo Score?
Mercury X1 scores 57.0 on the Robo Score. RoboThespian 3 scores 68.4. The Robo Score is a 0–100 credibility figure blending commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
Are Mercury X1 and RoboThespian 3 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 Mercury X1 and RoboThespian 3?
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
Mercury X1 vs RoboThespian 3 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 Score is calculated.