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What AI costs

Work out what a job will cost before you run it, and why the price per token is only half the bill.

Tokens are how AI is priced. The lesson runs 3 models on the same jobs and shows where the money goes. The price table and the calculator use each maker's own published prices.

Start with lesson 1

The lessons, in order

  1. Same price per token, smaller bill: what a job costs

    9 min read · 10 chapters · 2 short clips

    Claude Sonnet 5.5 costs exactly the same per token as the model it replaces, yet it is sold as up to 30% cheaper per task. We ran 3 models on the same jobs to see how that can be true. The answer shows what an AI bill is made of, and it applies to every model.

    1. Same fare, different bill1:23
    2. The price puzzle
    3. What the meter counts
    4. How we tested
    5. Round 1: quick questions
    6. Round 2: jobs with steps
    7. The luggage nobody mentions1:14
    8. Do you need the bigger model?
    9. Why bigger jobs save more
    10. What to do with this
ToolPut a job on the meterA calculator and a price list for the current models, from each maker's own price page.

Every lesson has the same 4 parts

  1. Watch

    The full video, and a short clip at each chapter if you only want that part.

  2. Read

    The longer explanation, with the sums worked out and a link to the source of every fact.

  3. Try it

    An experiment you run in your own AI assistant, with prompts to copy and what to look for.

  4. Check

    3 questions that put the idea in a new situation, each with the reason for its answer.