Designing a reliable and cost-efficient multi-LLM (Large Language Model) strategy is crucial for building scalable AI products, and this process involves model selection, routing, fallback logic, cost monitoring, and unified API integration. By adopting a multi-LLM strategy, developers can mitigate risks such as vendor lock-in, pricing volatility, and inconsistent performance, while optimizing for cost and performance by dynamically routing traffic and ensuring continuity with fallback options. The article highlights the importance of using unified APIs to simplify development and maintenance, as well as employing cost dashboards and performance tracking tools for continuous optimization. Eden AI facilitates this process by providing a centralized platform that integrates major LLMs under one API, offering model comparison, cost monitoring, and performance tracking to streamline the implementation of a multi-LLM strategy, allowing teams to focus on enhancing user experience and product value.