Gemini

Google's Gemini models combine large context windows with fast inference, making them well-suited for conversations that require processing long histories or complex instructions. Gemini 3.1 pro, in particular, offers an excellent balance of speed and capability — a solid option if you value cost-efficiency with strong multilingual performance.
Usage
To use Gemini as the LLM engine, pass the following JSON in the LLMConfig field of the StartAIConversation API. Gemini uses the OpenAI-compatible protocol:
// json — LLMConfig
{
  "LLMType": "openai",
  "Model": "gemini-3.1-pro-preview",
  "APIKey": "<your_gemini_api_key>",
  "APIUrl": "https://generativelanguage.googleapis.com/v1beta/chat/completions",
  "Streaming": true,
  "SystemPrompt": "",
  "Timeout": 3.0,
  "History": 5,
  "MetaInfo": {}
}
For full Conversational AI configuration (STT, TTS, interruption handling, VAD, etc.), see the TRTC Conversational AI API Reference.
Parameter reference
Field
Type
Required
Description
LLMType
String
Yes
Fixed value: "openai" (Gemini uses OpenAI-compatible protocol).
Model
String
Yes
Model: gemini-3.1-pro-preview, gemini-3-flash-preview, etc. See Gemini Models.
APIKey
String
Yes
Your Gemini API key from Google AI Studio.
APIUrl
String
Yes
Gemini OpenAI-compatible chat completions endpoint.
Streaming
Boolean
No
Enable streaming. Default: true.
SystemPrompt
String
No
System instruction to guide model behavior.
Timeout
Float
No
Timeout in seconds. Default: 3.
History
Integer
No
Conversation turns for context. Default: 0. Max: 50.
MetaInfo
Object
No
Custom parameters passed in the request body.
For more details on Gemini models and API, see the Google Gemini documentation.
Next step: Configure your TTS provider﻿

Field	Type	Required	Description
`LLMType`	String	Yes	Fixed value: `"openai"` (Gemini uses OpenAI-compatible protocol).
`Model`	String	Yes	Model: `gemini-3.1-pro-preview`, `gemini-3-flash-preview`, etc. See Gemini Models.
`APIKey`	String	Yes	Your Gemini API key from Google AI Studio.
`APIUrl`	String	Yes	Gemini OpenAI-compatible chat completions endpoint.
`Streaming`	Boolean	No	Enable streaming. Default: `true`.
`SystemPrompt`	String	No	System instruction to guide model behavior.
`Timeout`	Float	No	Timeout in seconds. Default: 3.
`History`	Integer	No	Conversation turns for context. Default: 0. Max: 50.
`MetaInfo`	Object	No	Custom parameters passed in the request body.