Playground

Interactive tools for poking at the ideas in the curriculum. Nothing to install, nothing to sign up for — change the inputs and watch what happens.

Token Counter

Paste any text and watch it split into tokens, with a cost estimate. The clearest way to see why prompts are priced the way they are.

Step through retrieval-augmented generation one stage at a time — ingest, chunk, embed, query, retrieve, generate — with your own documents selected.