
How to learn Physical Intelligence's robot brain without working at Physical Intelligence:
PI was in talks this year to raise $1B at an $11B valuation, and its brain, π0, is open source
three of its co-founders teach the ideas inside it on YouTube for $0: Sergey Levine, Chelsea Finn and Quan Vuong
here's the order I'd watch them in:
1: copy a human first
Levine's Berkeley CS 285, lecture 2 (Spring 2026), is supervised learning of behaviors: a robot copies human demos, then drifts off course after its first small mistake. that drift is why ALOHA and π0 predict a whole chunk of motion at once instead of one step at a time
2: learn the math π0 moves with
Stanford AA203, lecture 15 (Spring 2026). an hour in, it explains flow matching, the same math π0 uses to turn a decision into smooth arm motion
3: make it better after the demos run out
Chelsea Finn's Stanford CS224R: lecture 16 is RL for real robots, and lecture 17 is a guest lecture from Ashish Kumar, who led AI for Tesla Optimus
4: see the whole brain in one talk
Quan Vuong's guest talk in ETH's Robot Learning course is about π0.7. 13 minutes in, it folds a shirt on a robot arm that had no folding data of its own
then stop watching and start running it:
- openpi, PI's own code and π0 weights, 14.4K stars on GitHub
- LeRobot by Hugging Face, 28.5K stars, which fine-tunes π0 on your own demos
- a $122 SO-101 arm to record those demos on
main insight:
the lab in talks at $11 billion is built on three ideas stacked on top of each other: copy a human, move smoothly with flow matching, and let a vision-language model decide what to do next
all three are free lectures now. the order is the only part nobody hands you
P.S. my Optimus-style robot brain guide below turns this order into an 8-week plan
Martin @0x_meden
Tesla won't sell you Optimus or show you its brain.
but every humanoid brain built in public uses the same 3 layers, and all 3 are free to build at home for $0 to $230.
last night I got a humanoid waving on my laptop. here's the 8-week path to its brain