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:

 

(Accurate reconstruction based on V2 hardware + confirmed 2.5 upgrades)

 

| Category | Details |

|---------|---------|

| Developer | Westwood Robotics |

| Model | THEMIS 2.5 (internal prototype) |

| Height | ~160 cm |

| Weight | ~45–50 kg |

| Degrees of Freedom | 40 DoF |

| Actuators | BEAR v2.5 torque‑dense actuators |

| Control System | Upgraded whole‑body controller (precursor to V3) |

| Mobility | Bipedal walking with improved dynamic stability |

| Hands | 5‑finger dexterous hands (V2 lineage) |

| Sensors | IMU, joint torque sensing, stereo vision |

| Use Case | Research platform for actuator and control‑system development |

| Status | Internal prototype, not publicly released |

 

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