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cached 2026-03-30T12:35:52.728Z
karpathy/nanochat
karpathy/nanochat is a Python-based, single-GPU experimental harness for training and chatting with LLMs, positioned as a minimal, hackable full-stack ChatGPT clone. It covers tokenization, pretraining, finetuning, evaluation, inference, and a web chat UI, and is currently optimized around a GPT-2 speedrun benchmark with active development focused on pretraining efficiency.