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A layer that chooses which model should handle each request based on cost, speed, context size, or quality needs.
A model router stops every task from going to the biggest model by default. It can send simple classification to a cheap fast model, deep reasoning to a frontier model, long documents to a long-context model, and failed attempts to a fallback. The hard part is measuring quality so routing saves money without quietly degrading the product.
Plainly
Think of Model Router as roads and power for the app city. A layer that chooses which model should handle each request based on cost, speed, context size, or quality needs.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.