Creating a voice agent
Configure the voice, the real-time provider, and the LLM that drives the conversation.
Voices
Built-in voices:
| Voice | |
|---|---|
| Alloy | Echo |
| Fable | Onyx |
| Nova | Shimmer |
LLM models
For custom voice agents, choose the reasoning model. Cost is charged in credits.
| Model | Provider | Credits |
|---|---|---|
| Gemini 2.5 Flash Lite | 5 | |
| Gemini 2.5 Flash | 10 | |
| Gemini 2.5 Pro | 25 | |
| GPT-5 Chat | Azure OpenAI | 50 |
| GPT-5.1 Chat | Azure OpenAI | 60 |
| GPT-5.2 Chat | Azure OpenAI | 80 |
| GPT-5.3 Chat | Azure OpenAI | 100 |
| GPT-5.4 | Azure OpenAI | 120 |
Call direction
Set the agent to handle inbound calls, outbound calls, or both, depending on your use case.
tip
Lighter models (e.g. Gemini 2.5 Flash Lite) keep per-minute cost low for high-volume calling; reserve the GPT-5 family for conversations that need stronger reasoning.