Andrej Karpathy just casually dropped something on Twitter that’s got me sitting here with my third latte of the day, staring at my MacBook screen and feeling that familiar mix of excitement and low-key existential dread that seems to define 2025.

For those who don’t know, Karpathy is one of the godfathers of modern AI – co-founded OpenAI, former head of AI at Tesla, basically the kind of person who forgets more about neural networks before breakfast than most of us will ever learn. So when he posts about an AI agent that ran autonomously for two days and improved his tiny LLM training process by 11%, making it go from 2.02 hours to 1.80 hours to match GPT-2 performance, people pay attention.