LLM router architecture: best practices for 2026

What this post added

This post introduces LLM router architecture, detailing three primary routing strategies: rule-based, semantic, and predictive. It outlines production-ready architectural patterns, emphasizing low-latency request handling, robust failure management (circuit breakers, multi-provider failover), and the critical role of semantic caching before routing. The post positions vector search and a unified context layer (like Redis Iris) as essential for enabling both semantic caching and semantic routing, thereby optimizing LLM usage for cost and reliability.