Your first API call

Ten lines of code, one request, and a reply from a model. But the reply also tells you exactly what that sentence cost, and why it stopped where it did. Most people never look.

In this lesson you'll learn to

Write a model API request (model, max tokens, messages) and read the reply (content, stop reason, usage).
Work out what a call costs from its token usage and the price per million tokens.
Use the stop reason to spot a reply that was cut off, and fix it.
Recognise the same request and reply shapes across providers, and estimate a feature's monthly bill.

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