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The :floor variant optimizes for cost. When you use :floor, OpenRouter sorts the model’s providers by price and also makes flex service tier endpoints eligible, so a provider’s discounted flex tier can serve the request when it is the cheapest option.

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Usage

Append :floor to any model ID:

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How it works

:floor does two things:
  1. Sorts all eligible endpoints by price, the same effect as setting provider.sort to "price".
  2. Admits flex service tier endpoints into the eligible pool. Unlike the service_tier: "flex" parameter, which restricts routing to flex endpoints, :floor keeps the whole pool: flex endpoints simply compete on price. Since flex pricing is discounted, flex endpoints tend to sort first, with regular endpoints as the next-cheapest fallback if a flex endpoint is unavailable.
Billing follows the tier the provider actually serves: a request served on the flex tier is billed at the flex rate, and if the provider serves it on the default tier instead, you’re billed the default rate. See Service Tiers for the full comparison of tier-selection options. If you want price sorting without flex tier eligibility, set provider.sort to "price" instead of using :floor.