POST

Try POST /audio/speech — OpenAI API

OpenAI playground

Create speech

Credentials

OpenAI API key · sent as Authorization

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Body application/json

7 body fields

model · required · string — One of the available [TTS models](https://developers.openai.com/api/docs/guides/text-to-speech): `tts-1`, `tts-1-hd`, `gpt-4o-mini-tts`, or `gpt-4o-mini-tts-2025-12-15`.
input · required · string — The text to generate audio for. The maximum length is 4096 characters.
instructions · optional · string — Control the voice of your generated audio with additional instructions. Does not work with `tts-1` or `tts-1-hd`.
voice · required · string — The voice to use when generating the audio. Supported built-in voices are `alloy`, `ash`, `ballad`, `coral`, `echo`, `fable`, `onyx`, `nova`, `sage`, `shimmer`, `verse`, `marin`, and `cedar`. You may also provide a custom voice object with an `id`, for example `{ "id": "voice_1234" }`. Previews of the voices are available in the [Text to speech guide](https://developers.openai.com/api/docs/guides/text-to-speech#voice-options). Custom voices must be created from audio samples. Voices created from text prompts are supported only in Live.
response_format · optional · string — The format to audio in. Supported formats are `mp3`, `opus`, `aac`, `flac`, `wav`, and `pcm`.
speed · optional · number — The speed of the generated audio. Select a value from `0.25` to `4.0`. `1.0` is the default.
stream_format · optional · string — The format to stream the audio in. Supported formats are `sse` and `audio`. `sse` is not supported for `tts-1` or `tts-1-hd`.