Andrej Karpathy Releases Free 3.5-Hour Deep Dive Into How LLMs Like ChatGPT Actually Work

Andrej Karpathy, a founding member of OpenAI and former senior AI director at Tesla, has published a free, comprehensive lecture on YouTube titled "Deep Dive into LLMs like ChatGPT," walking a general audience through how large language models are built and how to use them effectively. The video runs roughly three and a half hours, tracing the full pipeline from pretraining through post-training and into practical usage, and it has already drawn more than 8 million views and over 127,000 likes.