CreateSpeechRequest

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "CreateSpeechRequest",
  "type": "object",
  "properties": {
    "model": {
      "type": "string",
      "description": "One of the available TTS models. tts-1 is optimized for speed, tts-1-hd is optimized for quality, and gpt-4o-mini-tts supports advanced voice instructions."
    },
    "input": {
      "type": "string",
      "description": "The text to generate audio for. The maximum length is 4096 characters."
    },
    "voice": {
      "type": "string",
      "description": "The voice to use when generating the audio. Previews of the voices are available in the Text to Speech guide."
    },
    "instructions": {
      "type": "string",
      "description": "Control the voice of your generated audio with additional instructions. Only supported with gpt-4o-mini-tts."
    },
    "response_format": {
      "type": "string",
      "description": "The format to audio in. Supported formats are mp3, opus, aac, flac, wav, and pcm. Opus is recommended for internet streaming and communication, aac for digital audio compression, and flac for lossless audio compression."
    },
    "speed": {
      "type": "number",
      "description": "The speed of the generated audio. Select a value from 0.25 to 4.0. 1.0 is the default."
    }
  }
}