Inworld TTS provider

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

inworld-tts-1.5-mini (alias Mini) — faster, lower latency.
inworld-tts-1.5-max (alias Max) — higher quality.
inworld-tts-2 (alias TTS2) — latest generation; supports the delivery_mode parameter.

Defaults to inworld-tts-1.5-mini if model omitted.

Voice Samples

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

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.
`delivery_mode`	string	—	`STABLE`, `BALANCED`, or `CREATIVE`. Only supported by `inworld-tts-2`.

{
  "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.
`delivery_mode`	string	—	`STABLE`, `BALANCED`, or `CREATIVE`. Only supported by `inworld-tts-2`.
`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.

​Voice Samples

​WebSocket

​Query Parameters

​Voice Settings

​REST API

​Fields

​Response