nanochat is a full-stack implementation of an LLM like ChatGPT in a single, clean, minimal, hackable, dependency-lite codebase. Run tokenization, pretraining, finetuning, evaluation, inference, and web UI on a single 8XH100 node.

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nanochat is a minimal, full-stack LLM implementation by Andrej Karpathy in approximately 1000 lines of code. It enables running the complete pipeline—tokenization, pretraining, finetuning, evaluation, inference, and web UI—on a single 8XH100 node for under $1000. The project achieves competitive performance at the $100 tier model level while maintaining clean, hackable code designed to make LLM development accessible for learning purposes.

nanochat: The best ChatGPT that $100 can buy