> ## 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. # Stop Stop sequences (up to 4) ## Supported Types ### ```go theme={null} stop := components.CreateStopStr(string{/* values here */}) ``` ### ```go theme={null} stop := components.CreateStopArrayOfStr([]string{/* values here */}) ``` ## Union Discrimination Use the `Type` field to determine which variant is active, then access the corresponding field: ```go theme={null} switch stop.Type { case components.StopTypeStr: // stop.Str is populated case components.StopTypeArrayOfStr: // stop.ArrayOfStr is populated } ```