Simon Willison’s Weblog

nanoGPT. “The simplest, fastest repository for training/finetuning medium-sized GPTs”—by Andrej Karpathy, in about 600 lines of Python.

Posted 2nd January 2023 at 11:27 pm

Recent articles

Claude Skills are awesome, maybe a bigger deal than MCP - 16th October 2025
NVIDIA DGX Spark: great hardware, early days for the ecosystem - 14th October 2025
Claude can write complete Datasette plugins now - 8th October 2025

python 1197 ai 1628 gpt-3 67 andrej-karpathy 33 generative-ai 1435 llms 1404

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