How We Cut LLM API Costs by 94%: A 3-Layer Caching Strategy

Last month, our LLM API bills hit $47,000. This month: $2,800. Same product. Same user experience. Same performance. 94% cost reduction without sacrificing quality. Here's the architecture that made it possible. The Wake-Up Call CFO's message: "Fix this or we shut down the AI features." We had 90 days. Most teams would panic and start cutting features. We treated it as an architecture problem, not a budget problem. The Solution: 3-Layer Caching + Intelligent Routing Layer 1: Prompt Caching (68% hit rate) Problem: Every request pays for the same tokens repeatedly.