Think step by step improved accuracy by 3% but doubled my costs

Reddit r/AI_Agents News

Summary

A developer tested adding 'think step by step' to a customer support AI agent, achieving a 3% accuracy gain but with a 40% latency increase and doubled costs, concluding that the net impact was negative and highlighting the importance of measuring production tradeoffs.

Tested adding 'think step by step' to a customer support agent's system prompt. Got an accuracy improvement of 3%. The latency increased by 40%. And the cost per query doubled. So I can conclude that the net impact was negative. If I hadn’t run the experiment, I probably would’ve shipped it immediately because the accuracy bump looks great in isolation. But the latency and cost impact are basically invisible unless you measure them explicitly. Curious if others have found prompt engineering best practices that completely failed once tested in production. What kinds of tradeoffs are you optimizing for now - quality, latency, cost, reliability, etc.?
Original Article

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