LLM Router Selects the optimal LLM model for each task. The single biggest cost lever in multi-agent systems — intelligent routing saves 45-85% while maintaining 95%+ of top-model quality. --- When to Use ✅ Use for : - Deciding which model to call for a specific task - Assigning models to DAG nodes in agent workflows - Optimizing LLM API costs across a system - Building cascading try-cheap-first patterns ❌ NOT for : - Prompt engineering (use ) - Model fine-tuning or training - Comparing model architectures (academic research) --- Routing Decision Tree --- Tier Assignment Table | Task Type | T…