OpenRouter Classifiers are a small feature with a large infrastructure implication. The gateway is no longer just a place to send model requests. It can label the request by work type, department, agent complexity, or another operational category before deciding how to route it.
That moves model selection into policy. An application may not need to decide every time whether a request deserves a fast model, a cheaper model, a reasoning model, or a stricter fallback. The gateway can classify the work, apply constraints, and collect metrics across many clients.
This is especially relevant for agent systems because agent traffic is not uniform. Planning, tool selection, code review, summarization, extraction, and final writing have different latency, cost, and reliability needs. Treating them as one undifferentiated stream leaves money and quality on the table.
For New Runtime, this supports the thesis that the durable layer may be gateway plus harness plus validation. The model is still central, but the operating system around inference decides how the work is recognized and routed.