Summary:

 

THEMIS 2.5 is an internal research prototype developed by Westwood Robotics as the transitional platform between THEMIS V2 and the next‑generation V3 architecture. Built on the V2 frame but upgraded with stronger BEAR actuators and a more advanced whole‑body control system, THEMIS 2.5 served as the engineering bridge that validated new hardware and algorithms before the redesign that would become V3. It was never marketed publicly but played a crucial role in the evolution of the THEMIS humanoid line.

 

Editorial:

 

THEMIS 2.5: The Prototype That Connected Two Generations

 

Some robots are built for the spotlight. THEMIS 2.5 wasn’t one of them.  

It lived in the lab — a quiet, iterative platform where Westwood Robotics pushed the limits of torque‑dense actuation, balance control, and dexterous manipulation.

 

THEMIS V2 had already proven the viability of Westwood’s BEAR actuators, but the team needed a platform to test the next wave of improvements without committing to a full redesign. THEMIS 2.5 became that platform: a V2 body upgraded with new actuator variants, refined joint sensing, and a more capable whole‑body controller.

 

The result was a robot that moved more smoothly, balanced more confidently, and handled manipulation tasks with greater precision. These upgrades informed the architecture of THEMIS V3, making 2.5 the essential “missing link” in the lineage — the robot that shaped the future without ever being shown to the public.

 

Specifications:

 

Dimensions & Build

(Not publicly published; inferred from V2 continuity.)  

- Height: ~1.6 m  

- Weight: ~45–50 kg  

- Design Intent: Actuator + control‑system development  

- Construction:  

  - THEMIS V2 chassis  

  - Upgraded BEAR v2.5 actuators  

  - 40‑DOF humanoid frame  

  - Research‑grade modular architecture  

 

Mobility

- Locomotion: Bipedal walking  

- Capabilities:  

  - Improved dynamic stability vs V2  

  - Whole‑body coordination tests  

  - Gait‑optimization experiments  

 

(No published speed metrics.)

 

Degrees of Freedom

- Total DOF: 40  

- Arms: Multi‑DOF humanoid arms  

- Hands: 5‑finger dexterous hands (same as V2)  

- Legs: Full bipedal DOF distribution  

 

Actuation

- Actuator Type: BEAR v2.5 torque‑dense actuators  

- Capabilities:  

  - Higher torque density than V2  

  - Better thermal performance  

  - Smoother whole‑body control  

  - Pre‑V3 actuator validation  

 

Manipulation

- Capabilities:  

  - Dexterous manipulation  

  - Torque‑controlled tasks  

  - Research‑grade grasping  

  - Whole‑arm coordination tests  

 

(Payload not published.)

 

Perception & Sensors

(Not publicly documented.)  

Likely included:  

- IMU  

- Joint torque sensing  

- Stereo or RGB‑D vision  

 

Compute & AI

(Not published.)  

- Early V3‑era whole‑body controller  

- Research locomotion stack  

- Real‑time control experiments  

 

Battery & Power

(Not published — internal prototypes often tethered.)

 

Connectivity

- Research‑lab interfaces  

- Early SDK + control APIs 

 

Applications

- Actuator stress‑testing  

- Whole‑body control development  

- Gait‑stability research  

- Manipulation experiments  

- Pre‑production validation for V3  

 

Pricing

- Not commercially sold  

(Internal research platform only.)

 

Westwood Robotics has NOT published for THEMIS 2.5:  

- Torque curves  

- Joint‑speed specs  

- Sensor resolution  

- Battery specs  

- Environmental ratings  

- Public

documentation  

 

THEMIS 2.5 exists only as an internal transitional platform, not a commercial product.

 

Image: Westwood Robotics

 

Company Source:

 

Westwood Robotics:  
https://westwoodrobotics.io

 

Key News & Coverage:

 

https://youtu.be/xpC3KfYGwIs?si=5whbaceTNYSwDPMJ

 

Addition Information:

 

THEMIS V1 (Early Research Platform)

    ↓

THEMIS V2 (First Publicly Demonstrated Model)

    - 40 DoF

    - BEAR actuators (first generation)

    - Full humanoid mobility + dexterous hands

    ↓

THEMIS 2.5 (Internal Transitional Prototype)

    - Upgraded BEAR v2.5 actuators

    - Improved whole‑body controller

    - Better balance + manipulation

    - Never publicly released

    ↓

THEMIS V3 (Next‑Generation Architecture)

    - Full redesign

    - Higher torque density

    - More efficient actuation

    - Advanced perception + control stack