We built a router to predict when a cheap model is enough. It does not work.
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If you serve a model cascade, escalation is your cost dial. Not your model choice, not your prompt, not your context window. The single number that moves your bill is what fraction of requests climb to the expensive tier. So the obvious thing to build is a router: look at the incoming request, predict whether the cheap model will get it right, and only pay for the expensive one when the answer is no. We built that. It does not work, and the reason turned out to be more interesting than a…
1Key Takeaways
- If you serve a model cascade, escalation is your cost dial.
- Not your model choice, not your prompt, not your context window.
- The single number that moves your bill is what fraction of requests climb to the expensive tier.
- So the obvious thing to build is a router: look at the incoming request, predict whether the cheap model will get it right, and only pay for the expensive one when the answer is no.
2AIWedia Score
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that if you serve a model cascade, escalation is your cost dial.
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