One of the available TTS models:
tts-1 or tts-1-hd
The voice to use when generating the audio. Supported voices are alloy,
echo, fable, onyx, nova, and shimmer. Previews of the voices are
available in the
Text to speech guide.
Optionalresponse_The format to audio in. Supported formats are mp3, opus, aac, flac,
wav, and pcm.
OptionalspeedThe speed of the generated audio. Select a value from 0.25 to 4.0. 1.0 is
the default.
The text to generate audio for. The maximum length is 4096 characters.