March 16, 2026

We've added support for new LLM models in the Voice Agent API:

• OpenAI GPT-5.3 Instant (gpt-5.3-chat-latest)
• OpenAI GPT 5.4 (gpt-5.4)
• Google Gemini 3.1 Flash Lite (gemini-3.1-flash-lite-preview)

Example:

{
  "type": "Settings",
  "agent": {
    "think": {
      "provider": {
        "type": "open_ai",
        "model": "gpt-5.3-chat-latest"
      }
    }
  }
}

For the full list of supported models and pricing tiers, visit our Voice Agent LLM Models documentation.

• Resolves an issue where the GPT-5.2 Instant model used an incorrect model ID and pricing tier. The model now uses the correct ID (gpt-5.2-chat-latest) and is assigned to the Advanced tier.