Build a Cost-Optimized Agent Routing Workflow with Palmyra X6 & Fallback Model Chains
Writer launched Palmyra X6 and a rebuilt Agent harness on August 13, 2026, reporting that its agent product now runs at 52% lower cost with 48% faster execution and 10% better quality. The economics behind that claim is model routing plus smart fallbacks. This workflow builds a LangGraph routing engine that assigns every agent subtask to the cheapest capable model and fails over through a fallback chain without breaking the run.