From Wolfram Alpha....

What Is ChatGPT Doing … and Why Does It Work?

https://writings.stephenwolfram.com/2023/02/what-is-chatgpt-doing-and-why-does-it-work/
>Stephen Wolfram explores the broader picture of what's going on inside ChatGPT and why it produces meaningful text. Discusses models, training neural nets, embeddings, tokens, transformers, language syntax.