Changelog

🤖 New LLM Models Support & Bug Fixes

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)

Example:

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

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

Fixes

• 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.