> ## Documentation Index > Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # RoutedServiceTier The service tier this request was routed to (e.g. flex, priority). The tier actually applied and billed is determined by the provider response and may differ. ## Example Usage ```python theme={null} from openrouter.components import RoutedServiceTier # Open enum: unrecognized values are captured as UnrecognizedStr value: RoutedServiceTier = "flex" ``` ## Values This is an open enum. Unrecognized values will not fail type checks. * `"flex"` * `"priority"`