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Inworld

Inworld specializes in AI-driven interactive characters for gaming, virtual worlds, and immersive experiences. Its TTS is tightly coupled with character personality, emotion systems, and contextual awareness. Choose Inworld if you're building game NPCs, virtual companions, or interactive narrative experiences where voice is part of a full character AI stack.
Usage
To use Inworld as the TTS engine, pass the following JSON in the TTSConfig field of the StartAIConversation API:
// json — TTSConfig
{
  "TTSType": "inworld",
  "APIKey": "<your_inworld_api_key>",
  "VoiceId": "Dennis",
  "ModelId": "inworld-tts-1.5-max",
  "Temperature": 1.0
}
For the complete TTSConfig parameter reference, see the Text-to-Speech Configuration.
Parameter reference
Field
Type
Required
Description
TTSType
String
Yes
Fixed value: "inworld".
APIKey
String
Yes
Your Inworld API key. Obtain from Inworld Studio.
VoiceId
String
Yes
The voice name to use (e.g., "Dennis"). See Inworld TTS Playground.
ModelId
String
Yes
Inworld TTS model ID (e.g., "inworld-tts-1.5-max"). See Inworld TTS Models.
Temperature
Float
No
Controls voice expressiveness. Default: 1.0.
Note:
Inworld voices and characters are configured in Inworld Studio. Refer to Inworld's documentation for voice setup details.
For more details on Inworld, see the Inworld documentation.
Next step: StartAIConversation API Reference﻿

Field	Type	Required	Description
`TTSType`	String	Yes	Fixed value: `"inworld"`.
`APIKey`	String	Yes	Your Inworld API key. Obtain from Inworld Studio.
`VoiceId`	String	Yes	The voice name to use (e.g., `"Dennis"`). See Inworld TTS Playground.
`ModelId`	String	Yes	Inworld TTS model ID (e.g., `"inworld-tts-1.5-max"`). See Inworld TTS Models.
`Temperature`	Float	No	Controls voice expressiveness. Default: 1.0.