Inworld

Inworld TTS provider — Mini (low-latency) and Max (high-quality) models.

Voice format: inworld.<Model>.<VoiceId>

Models: inworld-tts-1.5-mini (alias Mini — faster) and inworld-tts-1.5-max (alias Max — higher quality). Defaults to mini.

Voice Samples

Voice	Model	Gender	Sample
Inworld.Max.Hank	Max	Male
Inworld.Mini.Loretta	Mini	Female

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WebSocket

Query Parameters

Parameter	Type	Default	Description
audio_format	string	mp3	mp3, linear16.
sample_rate	integer	24000	8000, 16000, 22050, 24000, 44100, 48000.
language	string	—	BCP-47 language code.

Voice Settings

Field	Type	Default	Description
encoding	string	MP3	MP3 or LINEAR16.
sample_rate	integer	24000	Output sample rate in Hz.
language_code	string	—	BCP-47. Overrides language query param.

{
  "text": " ",
  "voice_settings": {
    "encoding": "LINEAR16",
    "sample_rate": 16000
  }
}

REST API

Fields

Field	Type	Default	Description
encoding	string	MP3	MP3 or LINEAR16.
sample_rate	integer	24000	Output sample rate in Hz.
language_code	string	—	BCP-47 language code.
output_type	string	binary_output	binary_output, base64_output, or audio_id.

Response

Default (binary_output): chunked audio bytes.

With output_type: "base64_output": JSON with base64-encoded audio.

With output_type: "audio_id": JSON with an audio_url for deferred retrieval.