Robots/Parts/AI model
Thinker
UBTech's own AI model for robots that need to understand what they see and plan a job. It looks at camera pictures, reads an instruction, works out the steps, judges where things are from the robot's point of view and points out the exact object it needs. UBTech has released a 4-billion-parameter version, Thinker 4B, for anyone to download, built on top of Alibaba's Qwen3-VL model. UBTech says Thinker powers the Walker S2 in factory work.
- 1 of 15
- robots in the database
UBTech- made by
- AI model
- brain layer
- Free
- listed price
Key numbers
- Made by
- UBTech
- Kind of model
- a vision-language model: it takes pictures and text and answers in text
- Open version
- Thinker 4B, with 4 billion parameters (the adjustable numbers a model learns)
- Built on
- Qwen3-VL-4B-Instruct, a model from Alibaba's Qwen team
- What it is trained for
- task planning, judging space from the robot's own viewpoint, keeping track of what happened earlier, and pinpointing objects in a picture
- UBTech's claim
- top results on seven tests for robot AI models
- Licence
- CC BY-NC-SA 4.0, free for non-commercial use only
Source: Hugging Face, UBTECH-Robotics/Thinker-4B (huggingface.co)
Price guide
Listed price
Free
The 4B version is free to download under a Creative Commons non-commercial licence, so a company cannot use it in a product it sells without UBTech's agreement. A reasoning version, Thinker Thinking 4B, is listed as coming soon. Whatever larger version runs in UBTech's own robots has not been released.
Where to buySource: GitHub, UBTECH-Robot/Thinker (github.com)
Strengths and trade-offs
Our analysisStrengths
Made for robot work, such as planning steps and finding objects, rather than general chat.
A version is free for anyone to download and test.
Small enough to run on a robot's own computer rather than a distant server.
Built on a well-known open model, so engineers already know how to work with it.
Trade-offs
The free version cannot be used commercially.
It plans and understands, but other software still has to move the arms and legs.
The test results are UBTech's own claims, not independent checks.
It is not public whether the robots run the same 4B version or a bigger private one.
Why robot makers choose it
Our readA factory robot has to understand an instruction, see where the parts are and decide what to do first. UBTech built its own model so it controls that thinking layer for its Walker robots, and releasing a smaller version helps draw researchers and developers to its platform.
This is our reasoning from the public facts. No maker has confirmed it.
Robots using it
This list covers only the robots researched so far. A robot missing here may still use this part.
Numbers and listed prices on this page come from the sources shown. Anything marked as our analysis, our read or our estimate is our own view and has not been confirmed by any company. Last checked 15 Oct 2026. How we verify