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POST
/
audio
/
speech
Generate Speech
curl --request POST \
  --url https://{controlPlaneURL}/api/llm/audio/speech \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "input": "<string>",
  "model": "<string>",
  "voice": "<string>",
  "instructions": "<string>",
  "response_format": "<string>",
  "speed": 123,
  "stream_format": "<string>"
}
'
"<string>"

Documentation Index

Fetch the complete documentation index at: https://www.truefoundry.com/llms.txt

Use this file to discover all available pages before exploring further.

Authorizations

​
Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Headers

​
x-tfy-metadata
string

Optional metadata for the request

Body

application/json

Text to convert to speech and speech generation options

​
input
string
required

The text to generate audio for. The maximum length is 4096 characters.

​
model
string
required

One of the available TTS models: tts-1, tts-1-hd or gpt-4o-mini-tts.

​
voice

The voice to use for single-speaker TTS. Can be a string (OpenAI format: alloy, ash, ballad, coral, echo, fable, onyx, nova, sage, shimmer, verse) or an object with name and languageCode (Vertex AI format).

​
instructions
string | null

Control the voice of your generated audio with additional instructions. Does not work with tts-1 or tts-1-hd.

​
response_format
string | null

The format to audio in. Supported formats are mp3, opus, aac, flac, wav, and pcm. Default: mp3.

​
speed
number | null

The speed of the generated audio. Select a value from 0.25 to 4.0. Default: 1.0.

​
stream_format
string | null

The format to stream the audio in. Supported formats are sse and audio. sse is not supported for tts-1 or tts-1-hd. Default: audio.

Response

Audio generated successfully

The audio file content