How to Use Model Router on Microsoft Foundry

Imagine you&rsquo;re building an app that calls an LLM. You default to Claude Opus 4.6 for everything. It works great. Until you see the bill. Here&rsquo;s the thing: not every prompt needs the most powerful model. A simple &ldquo;summarize this email&rdquo; doesn&rsquo;t require the same firepower as &ldquo;analyze this entire codebase and suggest improvements.&rdquo; What if the system could…