Tokens From the Bill

Token problems: 20 of 20

Token problems: the workbook

1. Count the Tokens

2. Subword Splitting

3. Punctuation Counts

4. Tokens per Word

5. Will It Fit?

6. The Price of a Call

7. Two Kinds of Token

8. Input or Output?

9. The Two-Part Bill

10. End-to-End Call Cost

11. Comparing Three Calls

12. The Average Call

13. The System Prompt

14. The System Prompt Tax

15. Calls in a Budget

16. Tokens on a Budget

17. How Long Will It Take?

18. The Split Matters

19. Pricing per Million Tokens

20. Tokens from the Bill

Given a bill, how do you work out how many tokens were used? A real model bill lists input and output on separate lines, each priced per million tokens. Divide each line's cost by that side's price per million, then scale up to tokens. Agent operators use this to audit usage after the fact, confirming that the bill matches what the logs show.

Problem

An agent task's bill shows $12 for input and $30 for output. Input is priced at $3 per million tokens, output at $15 per million. How many tokens did the task process in total?

Input tokens from the input charge

Output tokens from the output charge

Add for the total tokens

Practice 1

An agent task's bill shows $35 for input and $45 for output. Input is priced at $5 per million tokens, output at $15 per million. How many tokens did the task process in total?

Input tokens from the input charge

Output tokens from the output charge

Add for the total tokens

Practice 2

An agent task's bill shows $6 for input and $50 for output. Input is priced at $2 per million tokens, output at $10 per million. How many tokens did the task process in total?

Input tokens from the input charge

Output tokens from the output charge

Add for the total tokens