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 check whether the added context changed prompt length only slightly on average but pushed enough requests across a threshold where output length, routing behavior, or retrieval size expanded much more than expected. Small context changes can create nonlinear cost effects.
I would...
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