> ## 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. # SpeechRequestResponseFormat Audio output format ## Example Usage ```typescript theme={null} import { SpeechRequestResponseFormat } from "@openrouter/sdk/models"; let value: SpeechRequestResponseFormat = "pcm"; // Open enum: unrecognized values are captured as Unrecognized ``` ## Values ```typescript theme={null} "mp3" | "pcm" | Unrecognized ```