Costs jumped after a prompt change that only added a little more context. What would you check first?

Instruction: Explain how you would investigate a prompt-related cost regression.

Context: Tests how the candidate diagnoses the problem, chooses the safest next step, and reasons through recovery. Explain how you would investigate a prompt-related cost regression.

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I would verify how the prompt change affected both sides of the token bill. A small increase in input can...

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