What is a model router
A router sits between you and many providers: one account, one API key, one bill — and behind it, hundreds of models served by dozens of hosts. OpenRouter is the best-known. You ask for a model by name; the router picks a host that serves it and forwards your request.
Why it is ideal when tinkering. Trying ten models normally means ten accounts and ten keys. Through a router it means changing one model name in your code. For the experimenting phase — which model is good enough, which is fast enough, what does this class of task cost — nothing beats it, and the pay-as-you-go pricing means an evening of testing costs pocket change.
Why to question it in production. Four honest reasons, none fatal:
- Routing decisions are the router's. Your request may land on different underlying hosts at different times, with different speeds, served precision and privacy terms. Consistency is exactly what production wants and exactly what routing trades away — though routers do let you pin specific hosts, at which point you are using them as a convenient billing layer.
- One more party handles your traffic. Your prompts pass through the router and the host it picks. Two privacy policies apply, not one.
- A margin on every token. Routers add a small fee. Irrelevant while experimenting; real arithmetic at production volume, where going direct to the host you have chosen anyway is cheaper.
- One more dependency in the request path. An outage at the router is an outage of everything behind it.
The pattern that uses both well: experiment through a router, then take the model you settled on and go direct to its best host — our model pages show every host's price, speed and privacy terms for exactly that decision.
Where next: Providers, compared · Pointing your tools at a different model