> ## 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 ```python theme={null} from openrouter.components import SpeechRequestResponseFormat # Open enum: unrecognized values are captured as UnrecognizedStr value: SpeechRequestResponseFormat = "mp3" ``` ## Values This is an open enum. Unrecognized values will not fail type checks. * `"mp3"` * `"pcm"`