>   Nice but who pays for the API calls?

Since we're using these robots in my undegrad Cognitive Robotics course,
the API costs come out of the course budget.  But they're negligible.
Inference is cheap; it's training that's expensive.

Here's another video that better illustrates the back-and-forth with
GPT-4o as it operates its robot body:

https://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15494-s25/video/Celeste2.mp4

Clearly I'm still a novice at prompt engineering.  But it's fun to
practice with Celeste.

-- Dave