In the evolving landscape of multi-model AI, the ability to route each user request to the most suitable Large Language Model (LLM) based on factors such as cost, latency, accuracy, context, or format is crucial for SaaS companies. The article discusses the construction of smart routing layers that dynamically select models and leverage internal tools like AI model comparison and API monitoring to make informed routing decisions at scale. By defining routing criteria, using comparative benchmarks, monitoring runtime conditions, implementing token-aware routing, and utilizing both rule-based and machine-learning-driven approaches, companies can optimize costs, speed, and quality of AI services. It highlights the importance of continuous iteration and documentation of routing logic and the advantages of platforms like Eden AI, which provide a unified API endpoint, built-in dashboards for comparison, and a routing layer to simplify the complexity of directing requests to the optimal model. This strategic approach is emphasized as a competitive advantage, ensuring superior user experiences and fostering innovation in AI deployment.