Robot landscape / Quadrupeds

Quadrupeds

A quadruped carries load on its body, not in an arm. Standing load and continuous walking load are different specifications and stay on separate rows. Unitree B2 is an industrial inspection/rescue quadruped; Boston Dynamics Spot is a dynamic sensing platform; Unitree Go2 is a consumer/education family. Go2 payload is not B2 standing load. Neither class is a humanoid.

Class definition

Legged ground robots (IFR type A2 walking). The comparable load metric is standing versus continuous walking load; a vendor's mounted-payload figure is labeled separately and never summarized into one unqualified payload value. Consumer Go2 SKUs are a different family from industrial B2 and stay in their own table.

Boundary. Quadruped chassis load is not a biped arm load and not an exoskeleton assistance figure. Do not move these numbers into a humanoid table. Do not put a Go2 ≈7–8 kg payload beside B2’s ≥120 kg standing transport load.

Unitree B2 vs Boston Dynamics Spot

Rows with a metric only one vendor publishes show —. Speed is qualified (special configuration vs. standard). Spot's mounted payload is a different metric from B2's transport load and has its own row.

Sources: Unitree B2 [M1]; Boston Dynamics Spot [M2].
MetricUnitree B2Boston Dynamics Spot
Mass (with battery)≈60 kg [M1]33.8 kg [M2]
Standing transport load≥120 kg [M1]—
Continuous walking load>40 kg [M1]—
Mounted payload capacity—14 kg (payload mounting) [M2]
Speed>6 m/s (special configuration; speed-limited in practice) [M1]1.6 m/s [M2]
Stairs / slopestairs 200–250 mm continuous; slope >45° [M1]slope ±30° [M2]
Obstacle400 mm forward climb [M1]—
IP ratingIP67 [M1]IP54 [M2]
Temperature−20 to 55 °C [M1]−20 to 55 °C [M2]
Battery45 Ah, 2250 Wh, 58 V [M1]564 Wh [M2]
Runtime4–6 h listed [M1]~90 min typical (varies by payload and environment) [M2]
Endurance / rangeno-load walk >5 h / >20 km; 20 kg walk >4 h / >15 km [M1]—
Computei5 + i7; optional up to 3× Orin NX [M1]—
Sensors3D LiDAR ×1 + depth ×2 + optical ×2 (config) [M1]360° terrain sensing, 4 m range [M2]
I/O1 GbE ×4, USB3 ×4, 12 V ×4, 24 V ×4 [M1]DB25 ×2; 35–58.8 VDC, 150 W per port [M2]
Optional manipulator—Spot Arm (optional) [M2]
Wheeled footoptional (B2-W) [M1]—

B2 jump >1.6 m, ditch 0.5–1.2 m, joint torque ~360 N·m are published for B2 only and are not shown beside Spot because Spot does not publish matching definitions. Spot's payload mounting is 850 × 240 × 270 mm with M5 T-slot rails; its battery is a 5.2 kg swappable pack.

Unitree Go2 — consumer / education family

AIR, PRO, X, and EDU are separate columns on the vendor page. Dimensions are converted from centimetres to millimetres. Payload kg and ≈3000 W peak power stay on separate rows. Max joint torque is the largest joint motor; the vendor footnote says the twelve motors differ. AIR leaves torque and the 8-core CPU unpublished (marked ○ on the vendor page).

Source: Unitree Go2 product page [M6]. Standing/crouch envelopes converted from vendor centimetres. Prices exclude tax and freight.
Metric Go2 AIR Go2 PRO Go2 X Go2 EDU
Price & warranty
Listed price$1600 [M6]$2800 [M6]$4500 [M6]contact sales [M6]
Warranty6 months [M6]12 months [M6]12 months [M6]12 months [M6]
Envelope & mass
Standing (L × W × H)700 × 310 × 400 mm [M6]700 × 310 × 400 mm [M6]700 × 310 × 400 mm [M6]700 × 310 × 400 mm [M6]
Crouching (L × W × H)760 × 310 × 200 mm [M6]760 × 310 × 200 mm [M6]760 × 310 × 200 mm [M6]760 × 310 × 200 mm [M6]
Mass (with battery)about 15 kg [M6]about 15 kg [M6]about 15 kg [M6]about 15 kg [M6]
Materialaluminium alloy + high-strength engineering plastic [M6]aluminium alloy + high-strength engineering plastic [M6]aluminium alloy + high-strength engineering plastic [M6]aluminium alloy + high-strength engineering plastic [M6]
Load & speed
Payload≈7 kg (MAX ~10 kg) [M6]≈8 kg (MAX ~10 kg) [M6]≈8 kg (MAX ~12 kg) [M6]≈8 kg (MAX ~12 kg) [M6]
Speed0–2.5 m/s [M6]0–3.5 m/s [M6]0–3.7 m/s (MAX ~5 m/s) [M6]0–3.7 m/s (MAX ~5 m/s) [M6]
Max climb dropabout 150 mm [M6]about 160 mm [M6]about 160 mm [M6]about 160 mm [M6]
Max climb angle30° [M6]40° [M6]40° [M6]40° [M6]
Joints & power
Knee motors12 aluminium knee-joint motors [M6]12 aluminium knee-joint motors [M6]12 aluminium knee-joint motors [M6]12 aluminium knee-joint motors [M6]
Max joint torque (largest motor)—about 45 N·m [M6]about 45 N·m [M6]about 45 N·m [M6]
Range of motionbody −48–48°; thigh −200–90°; shank −156–−48° [M6]body −48–48°; thigh −200–90°; shank −156–−48° [M6]body −48–48°; thigh −200–90°; shank −156–−48° [M6]body −48–48°; thigh −200–90°; shank −156–−48° [M6]
Voltage28–33.6 V [M6]28–33.6 V [M6]28–33.6 V [M6]28–33.6 V [M6]
Working maximum powerabout 3000 W [M6]about 3000 W [M6]about 3000 W [M6]about 3000 W [M6]
Compute & sensors
Basic computing power—8-core high-performance CPU [M6]8-core high-performance CPU [M6]8-core high-performance CPU [M6]
High-compute module———optional, e.g. Orin 40–100 TOPS [M6]
4D LiDAR L2equipped [M6]equipped [M6]equipped [M6]equipped [M6]
HD wide-angle cameraequipped [M6]equipped [M6]equipped [M6]equipped [M6]
Wireless vector positioning—equipped [M6]equipped [M6]equipped [M6]
Foot-end force sensor———equipped [M6]
Depth camera———equipped [M6]
Battery & charger
Smart batterystandard 8000 mAh [M6]standard 8000 mAh [M6]standard 8000 mAh [M6]long endurance 15000 mAh [M6]
Battery lifeabout 1–2 h [M6]about 1–2 h [M6]about 1–2 h [M6]about 2–4 h [M6]
Chargerstandard 33.6 V 3.5 A [M6]standard 33.6 V 3.5 A [M6]standard 33.6 V 3.5 A [M6]fast charge 33.6 V 9 A [M6]
Connectivity & development
Wi-Fi 6 dual-bandequipped [M6]equipped [M6]equipped [M6]equipped [M6]
Bluetooth5.2 / 4.2 / 2.1 [M6]5.2 / 4.2 / 2.1 [M6]5.2 / 4.2 / 2.1 [M6]5.2 / 4.2 / 2.1 [M6]
4G module (with GPS)—equipped [M6]equipped [M6]equipped [M6]
Secondary development——partial [M6]equipped [M6]
Charging-pile compatibility——equipped [M6]equipped [M6]

Vendor footnote [1]: maximum torque is the largest joint motor; the twelve motors differ. Marketing headline “approx. 5 m/s tested in lab” matches the X / EDU MAX speed, not AIR / PRO. ISS 2.0 remote-control distance >30 m is an open-environment claim and is not a payload figure.

Engineering models

Official Unitree robot models for simulation. B2 and B2-W are assembled live on the 3D models page; that page is publication evidence and adds no specification.