Your Users Will Never Pick the Right Model. Build a Router Instead.

Auto mode isn’t optional anymore - it’s what really help the customer harnest the value from your agent. The Problem Nobody Wants to Admit You built a great AI agent. Multiple models available - Opus for complex reasoning, Sonnet for general use, Haiku for quick answers, GPT-4o-mini for cost efficiency. You add a nice model selector in the UI and let users choose. Then you watch the logs. The user who asks “what’s the price of AAPL?” selects Claude Opus. That’s $0.15 for a query that Haiku could handle for $0.001. 150x expensive for the same answer.