Back in 2016, Jensen Huang hand-delivered a $129,000 AI supercomputer that weighed 134 pounds to OpenAI. Today he held up a laptop he says matches it, and it starts at $2,599. Better chips are part of it, but the bigger trick is that AI figured out how to do its math with numbers that only have 16 possible values. Every AI model is basically a giant pile of dials it tuned during training, called weights. A 120 billion parameter model has 120 billion of them. How precisely you store each dial…