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Engineering proposes routing easy requests to a small model and hard ones to a large model. How do you evaluate the proposal?

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Routing is one of the biggest cost levers in AI products, and one of the easiest to get subtly wrong. The interviewer wants the savings arithmetic and the misrouting risk in the same answer.

Updated Oct 2026 · Original practice questions with worked answers and teaching rubrics. Our editorial policy explains the sources, review process and limits.

Routing is one of the biggest cost levers in AI products, and one of the easiest to get subtly wrong. The interviewer wants the savings arithmetic and the misrouting risk in the same answer.

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