Cost & Token Budgeting

You send a model a one-line question and a dense three-page answer comes back. When the bill arrives, those three pages cost far more than your one line, and not only because they are longer. Once you see how LLM pricing works, the invoice stops surprising you

8 lessons, each with runnable code in the browser.

1. How Pricing Works
2. Estimating Cost Before You Call
3. Where the Money Goes
4. Cutting Costs
5. Input vs Output Cost
6. Caching to Cut Cost
7. Batch and Async Discounts
8. Budgets and Spend Alerts

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