Comparison
Unitree’s catalogue is easy to shop by thumbnail and easy to get wrong. Go2 looks like a robot dog you could live with. B2 looks like a serious machine. Only the second impression is reliable, and even then B2 is a quadruped for sites, not a housekeeper on two legs.
If you still need the class split between toys, companions, and walking platforms, start with robot dogs in 2026. This piece is the SKU choice inside the walking class: compact learner versus industrial mule.
ⓘ Quick Answer
Buy Go2 (or the older Go1) for labs, classrooms, and demos that need a real walking quadruped at a comparatively accessible price. Buy B2 (or B1) when you have a site, a payload, stairs or rough ground, trained operators, and a quote-driven budget. Do not buy B2 for the living room. Do not buy Go2 to inspect a plant as if it were a B2.
Two sizes, two jobs
Go1 / Go2
Compact quadrupeds. Education, developer work, light inspection demos. Runtime often around one to two hours. Light payload. Go2 adds newer sensing options on supported versions, including LiDAR on some configurations. Street prices for Go2 often start around the mid four figures in US dollars depending on version and seller.
B1 / B2
Industrial quadrupeds. Inspection, research, carrying sensors across terrain that wheels dislike. B2 is the stronger, faster, higher-payload sibling in that pair. Pricing is typically request-quote. Operators, commissioning, and safety procedures are part of the product whether the invoice says so or not.
Catalog titles sometimes say “humanoid” or “domestic” next to B1 and B2. The mechanics do not. Four legs, payload, inspection. If you wanted a chore humanoid, you are in the wrong aisle — see what home humanoids can actually do.
Go2 is not a pet, B2 is not a classroom toy
Go2 will scratch floors, startle dogs, and eat batteries. It is a reasonable way to learn locomotion if you will supervise it. It is a poor substitute for Loona if you wanted an indoor companion, and a poor substitute for B2 if you needed forty kilograms across a yard.
B2 in a hallway is theatre with a trip hazard. It belongs where a wheeled cart fails: stairs, slopes, uneven sites, sensor walks. You will need training, a safety plan, and a reason beyond “the video is great”.
💡 What to Check
Version and payload, not just the family name. SDK access, spare batteries, import rules, and who services a broken joint in your country. Go1 remains a valid older education platform; do not mix its specs with Go2 on a spreadsheet from memory.
A straight decision
Student team, demo, developer learning: Go2, unless you already own a healthy Go1 and it meets the brief. Industrial inspection or research with real payload and terrain: B2, or B1 if a partner quotes that configuration instead. Household companionship: neither. Walk away from any listing that sells B2 at toy money or Go2 as a babysitter.
Cost is more than checkout
Batteries, shipping, duty, extra legs, operator time, and the probability you will crash a learner robot in month one. Industrial quotes hide none of that if you ask. Consumer-looking checkouts for compact models still surprise people with accessories. Price the year, not the unboxing.
Lineup checklist
Choose Go2 if
- The users are students, developers, or demonstrators.
- Payload is light and the ground is mostly kind.
- You can supervise every run.
Choose B2 if
- The site is why wheels failed.
- You have operators, not weekend hobbyists.
- You are buying a quoted configuration, not a surprise gift.
Final Thoughts
Pick the mass and the mission. Go2 (and Go1) are how people learn to walk a machine without pretending they bought a factory. B2 (and B1) are how a site team carries sensors where wheels fail. Mixing those jobs is how a school overspends and a plant underspecifies. Compare Go1, Go2, B1, and B2 on Robot.help as walking machines with different jobs — and keep pets and humanoids in their own sentences.
If a salesperson leans on the word humanoid while pointing at B2, ask them to count the legs. If they lean on the word pet while pointing at Go2, ask who will supervise it and where it will charge. Those two questions end most of the confusion in this lineup.
Frequently Asked Questions
Is B2 a home humanoid?
No. It is an industrial quadruped. Listing language can be misleading. Trust the four legs.
Should a school buy B2 to look impressive?
Usually no. Go2 (or Go1) matches education budgets and supervision. B2 is a site machine.
Is Go1 obsolete if Go2 exists?
Go2 is the newer compact platform. Go1 can still be the right used or budget education machine if support and parts are real.
Can I use Go2 outdoors?
Light outdoor demos happen. It is not ruggedised like a high-end inspection quadruped. Match terrain to the model class.
Where does Loona fit?
Indoor companion, not this comparison. If you wanted a pet-like character, you do not want Go2 or B2.