karpathy/nanochat

★60,433PythonMIT⑂ 8,475Issue 28Updated Sep 8, 2026

The best ChatGPT that $100 can buy.

Karpathy's minimal harness trains a usable ChatGPT clone for $100 — Built by Andrej Karpathy, nanochat is a compact, hackable codebase covering tokenization through inference for training your own LLM on a single GPU node. A GPT-2-grade model that cost $43,000 in 2019 now trains for about $48, with a single --depth flag auto-tuning all other hyperparameters. It also runs a public speedrun leaderboard tracking the fastest time to GPT-2 capability.

LLMs & ML

Metrics

Relative growth (7d)+0%Growth over the last 7 days relative to size

Acceleration-80%Change in growth pace from the week before

Attention15The three metrics scaled to 0–100 and combined

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Star growth and Trending appearances (last 30 days)

First listed+424★/dayDaily

Oct 13, 2026Nov 11, 2026

Bands mark days on the trending list (darker = higher rank)

Daily trending ranks as a table (2 days)

Date	Daily
Nov 4, 2026	python #6 +479
Nov 3, 2026	#14 +321 python #5

Created Oct 13, 2025 · First on trending Nov 3, 2026

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Metrics

Star growth and Trending appearances (last 30 days)

Other notable repositories in the same category (LLMs & ML)

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