Models & Stacks
NanoChat Full Guide
Karpathy's nanochat: the full pipeline to train your own ChatGPT from scratch, from the $100 run to the $1,000 tier.
Published July 2026
Look inside
Karpathy's code to train your own ChatGPT from scratch. The $100 model is honest about its limits: 'a preschool-aged child' that writes stories and hallucinates. The value is the full pipeline: tokenizer, pretraining, SFT, RL, inference engine, and a web UI you talk to 4 hours later.
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