- In short
- When both a cost ceiling and a latency target must be met at once, the task is to identify which single lever moved the configuration into range and articulate why. A stable, repeated system prompt makes caching the strongest candidate, so caching typically dominates cost reduction over a model-tier change in that scenario. A sound justification ties the chosen lever to the specific workload property that makes it effective, rather than naming a general best practice.
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