You are probably paying for tokens you already paid for. Here is how prompt caching and a few upstream habits can cut your LLM API bill by 40% or more.

JSON mode still breaks in predictable ways — malformed output, wrong types, dropped fields. Here's a symptom-by-symptom guide to diagnosing and fixing each one.

These two prompt types serve fundamentally different purposes, and understanding the distinction helps you use AI tools considerably more effectively, especially through the API.