Karpathy releases nanochat — full LLM chat stack for ~$100

| The best ChatGPT that $100 can buy.

⭐️ Andrej Karpathy, our AI legend, just dropped nanochat, a complete, end-to-end implementation of an LLM-based chat assistant like ChatGPT — but compact, clean, and easy to hack. The entire stack, from tokenization to web UI, is implemented in one minimal codebase with almost no external dependencies.

It’s designed to run on a single 8×H100 node, orchestrated by simple scripts like speedrun.sh, which execute the entire lifecycle — tokenization, pretraining, finetuning, evaluation, inference, and even web serving through a lightweight chat interface.

In short, Nanochat lets you train, run, and chat with your own LLM — all for about the cost of a weekend GPU rental.

⭐️ Read the this introduction doc to learn all the steps Nanochat execute with the speedrun.sh file: github.com/karpathy/nanochat/discussions/1.

Repo: github.com/karpathy/nanochat
Nanochat test: nanochat.karpathy.ai