> ## 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. # AnthropicSystemClearAt ## Example Usage ```typescript theme={null} import { AnthropicSystemClearAt } from "@openrouter/sdk/models"; let value: AnthropicSystemClearAt = "next_user_message"; // Open enum: unrecognized values are captured as Unrecognized ``` ## Values ```typescript theme={null} "next_user_message" | "never" | Unrecognized ```