4. Add routing control when you need it

The default request can stay simple.

When you need more control, RouteMarket also supports fields like:

• provider
• route
• routing_preference
• source_policy

Example:

{
  "model": "gpt-5.4",
  "messages": [
    { "role": "user", "content": "hello" }
  ],
  "routing_preference": "highest_reliability"
}

Next, learn what model means.