Karpathy's New 1-Hour Stanford Lecture Compresses All of AI Engineering Into Five Layers — and Ends With 'Delete Everything, Keep Graph'

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Andrej Karpathy released a one-hour Stanford lecture building AI engineering from scratch, structured as a five-stage progression: LLM (treat the model as a general-purpose computer reprogrammable at runtime), Prompt (a program written in natural language), Agent (model plus goal, context, memory and tools), Loop (inner loop learning from context vs. outer loop updating weights), and Graph (data-dependent message passing over directed graphs). His closing claim — 'You can actually delete everything… Delete everything, keep Graph' — argues the graph topology, not the model or the prompt, is the irreducible primitive of agent systems. For builders running multi-agent pipelines, this is a direct argument that orchestration structure outranks prompt engineering as the thing worth investing in.