Model Routing Is Simple. Until It Isn’t.

雷达摘要

Building a router into your agent sounds like an easy win. Send simple requests to cheaper models, reserve expensive ones for harder tasks, or route by specialty — Claude for code, Gemini for multimodal, and so on. A classifier or heuristic makes the call, costs go down, performance stays up. Done. Except it’s not. Most routing systems assume that model sel…