AgiBot X2 Ultra Full-Stack Open Source Humanoid Robot

AgiBot X2 Ultra Full-Stack Open Source Humanoid Robot

Agibot X2 Ultra is a compact humanoid robot developed by AgiBot (AGIBOT Innovation, Shanghai) as the higher-end model in the X2 series. Compared with the standard X2, the Ultra version adds more degrees of freedom and a richer perception suite, and it supports autonomous docking/charging with a dedicated station to extend operating time in public demos and research environments. The platform targets embodied AI, human–robot interaction (HRI), education, and light service tasks where agility, sensing, and developer access are important.

Design and Features

Compact, human-compatible form factor

Both X2 variants share a footprint of 1310 × 460 × 210 mm (H×W×L) and stand at about 1.31 m. The Ultra is specified at about 39 kg, balancing mobility with a stable base for indoor demos and HRI. The format fits classrooms, labs, and public venues while maintaining human-scale reach. 

High-mobility, high-DoF architecture

The Ultra increases the total actuated DoF to 30 (versus 25 on X2), including 1 DoF neck, 7 DoF per arm, 3 DoF waist, and 6 DoF per leg. The additional joints improve expressive gestures, arm dexterity, and whole-body coordination for demonstrations and research tasks. 

Rich perception suite for embodied AI

Compared with the base X2, X2 Ultra adds a 3D LiDAR, front stereo RGB cameras, a rear RGB camera, and an RGB-D camera, alongside an interactive head RGB camera and head touch sensor. This multi-sensor array supports mapping, obstacle perception, people detection, and contact-aware interactions. 

Autonomous docking and charging

A key differentiator is auto-charging via a dedicated docking station (Ultra edition), enabling longer duty cycles for continuous exhibitions, way-point tours, or concierge scenarios without manual battery swaps. 

Developer-first software (AimDK_X2)

AimDK_X2 provides task APIs for motion, perception access, and behavior orchestration; documentation includes quick-start samples and FAQs for locomotion and interaction control. Ultra-specific debug interfaces expose high-speed USB on the internal compute (e.g., RK3588 and Orin NX) for development and data capture. 

Technology and Specifications

Series parameters (Ultra edition) as published in AgiBot’s technical documentation: 

Arm span (w/o end-effector): 558 mm

Perception system (Ultra vs. X2):

• 3D LiDAR: Equipped on Ultra; not equipped on base X2

• RGB-D camera: Equipped on Ultra; not equipped on base X2

• Front stereo RGB cameras + rear RGB camera: Ultra

• Interactive RGB camera & head touch sensor: Both variants 

Software & SDK:

• AimDK_X2 (task-level programming, sensor access, motion control) with code samples and FAQs for locomotion, arbitration, and safety notes.

Applications and Use Cases

Embodied-AI research & education

With 30 DoF and a rich sensor stack, X2 Ultra is positioned for policy learning, tactile/HRI studies, sensor fusion, and whole-body motion research. AimDK_X2 reduces bring-up time, letting teams script behaviors and access data without building a control stack from scratch. 

Public interaction, tours, and edutainment

The perception array (stereo RGB, RGB-D, LiDAR) and the ability to self-dock for charging support continuous public demos, museum tours, and retail activations, where “always-on” presence and expressive motion are valued. 

Light service and facility scenarios

In low-risk spaces, X2 Ultra can handle way-finding, reception, and basic patrol tasks, using LiDAR and RGB-D for obstacle-aware navigation while the head camera and touch sensors enable more natural HRI. 

Prototype industrial workflows

Although not an industrial manipulator, the Ultra’s added arm DoF and perception make it suitable for proof-of-concept demonstrations (e.g., part presentation, inspection cues) that inform requirements for larger, production-oriented humanoids. (Context: AgiBot communications emphasize ecosystem growth around general-purpose robots.) 

Advantages / Benefits

• Expanded dexterity: 30 DoF (with 7-DoF arms) improves reachability and expressive gestures versus the base X2. 

• Richer sensing: 3D LiDAR + RGB-D + multi-RGB coverage yields better mapping, depth reasoning, and user awareness for HRI and navigation. 

• Autonomous uptime: Dock-based auto-charging supports longer, unattended deployments at events or in public spaces. 

• Developer access: AimDK_X2 with samples, FAQs, and Ultra-specific debug I/O speeds experimentation and integration. 

• Indoor-friendly size: 1.31 m / ~39 kg form factor provides stability without the footprint and overhead of full-size humanoids. 

FAQ Section

What is Agibot X2 Ultra?
A compact humanoid robot in the X2 family that adds 30 actuated DoF, a richer perception suite, and autonomous docking/charging for extended operation. 

How does X2 Ultra work?
It combines a high-DoF bipedal body with stereo/RGB/RGB-D cameras and 3D LiDAR for perception. Developers program behaviors using AimDK_X2, which exposes task-level APIs and sensor streams. 

Why is X2 Ultra important?
The Ultra’s added joints, depth + LiDAR sensing, and self-charging make it suitable for continuous public demos, HRI research, and embodied-AI experiments without the logistics burden of larger humanoids. 

What are the headline specifications?
1.31 m height, ~39 kg weight, 30 actuated DoF (neck 1, arm 7×2, waist 3, leg 6×2), 558 mm arm reach (w/o end-effector), operating –10 °C to 40 °C, and enhanced sensors (3D LiDAR, RGB-D, front stereo RGB, rear RGB), with AimDK_X2 SDK. 

Does the base X2 have LiDAR or RGB-D?
No. Those are Ultra-only features per the official comparison table. The base X2 uses an interactive RGB camera and touch sensors but omits LiDAR/RGB-D. 

Summary

Agibot X2 Ultra extends the X2 platform with 30-DoF dexterity, LiDAR + RGB-D perception, and auto-docking to support long-running demos and research deployments. Its 1.31 m, ~39 kg form factor and AimDK_X2 software make it approachable for labs, classrooms, and public venues that need a capable, developer-ready humanoid without the footprint of full-size systems. For teams exploring embodied AI and HRI with real-world constraints, X2 Ultra offers a balanced mix of mobility, sensing, and integration readiness backed by official tooling and documentation.