Stop Funding the Frontier

Your AI bill keeps climbing. You'd move half your work to a cheaper model tomorrow. You just can't prove it keeps up.



Meanwhile, developers on Reddit are running the cheap model for the grunt work and the frontier only for the hard parts, at 96% of the performance for 46% of the cost. The difference isn't a better model. It's one measurement they ran and you haven't.



This book hands you the one thing the whole shelf skips: proof, on your own work, that a cheaper model holds the line, so you route the easy money away from the frontier and keep the margin. Today you pull your real spend number. By Chapter 5 you have your first cost-per-task report, in your own numbers, not a vendor's. By Chapter 7 a router sends each task to the cheapest model that still wins. By Chapter 10 you have a one-page swap you can defend to a partner, a team, or yourself.



The 20-plus cost-cutting books on Amazon were written for someone else. They tune an enterprise system running 10,000 queries a day for a CFO. None of them measures what a cheaper model does on YOUR work. You can't ask the incumbent's benchmark whether your code review survives the switch. You can't hand a teammate a vendor's "73% cheaper" claim and call it proof. This is the real-world validation they all skipped.



The logger, the harness, the router and the P&L all come with a free companion GitHub repo: every file organized by the chapter that builds it, and the analysis tools run the moment you clone, with no key and nothing installed.



Here's what you'll build:


1. A trace logger that records the real cost of every model call, on your own work.


2. An evaluation that proves what a cheaper model does to your quality, in cost-per-task.


3. A ranked shortlist of cheaper models, scored on your tasks, wired behind one interface (OpenRouter, LiteLLM, Ollama, open-weight, and local via vLLM).


4. A router that sends each task to the cheapest model that wins.


5. A tiered agent where the frontier plans and verifies while cheap models do the work.


6. A one-page swap you can defend, turning a $500-a-month frontier bill into margin you keep.


7. A monthly re-measurement routine that survives the next price change.



Every week another "cut your AI costs" book ships, and every one of them measures its own system, not yours. This one is 180-plus pages of runnable code and your own numbers, from first trace to defended swap. Stop funding the frontier. Scroll up and grab your copy.