# OpenAI GPT-Live Now Available for Telnyx Voice AI Assistants

> Source: <https://telnyx.com/release-notes/openai-gpt-live-voice-ai-assistants>
> Published: 2026-09-30 12:00:00+00:00

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OpenAI GPT-Live (`openai/gpt-live-1`) is now available in Telnyx Voice AI Assistants. GPT-Live is OpenAI's full-duplex speech-to-speech model: it listens and speaks at the same time, so callers can interrupt mid-sentence and the conversation keeps its rhythm. Telnyx provides the phone number, the call, and the tool layer around it.

- **OpenAI GPT-Live model:** Select`openai/gpt-live-1` as the model for a Voice AI Assistant in Mission Control.
- **Bring your own OpenAI key:** GPT-Live requires your OpenAI API key, added to Telnyx as an integration secret. OpenAI bills the GPT-Live session to your OpenAI account, and your Telnyx call and platform usage stays on your Telnyx account.
- **Speech-to-speech calls:** Call audio streams to OpenAI over a WebSocket, so the conversation itself does not pass through separate STT and TTS steps.
- **OpenAI Live voices:** The Voice tab lists OpenAI Live voices for GPT-Live assistants, with`marin` as the default.
- **Delegation for reasoning and tools:** GPT-Live handles the conversation and hands reasoning and tool calls to a delegation model. Your assistant's tools, MCP servers, call transfers, and hangups keep working through delegation.
- **Current limits:** GPT-Live assistants use OpenAI Live voices only, cannot use a fallback model, and cannot be combined with workflows.
- **Direct SIP option:** To run GPT-Live from your own backend instead of a Telnyx assistant, the GPT-Live SIP guide shows how to route a Telnyx number straight to OpenAI over encrypted SIP and control the session from your application.

- GPT-Live handles turn-taking and barge-in inside the model, so callers can interrupt and talk over the agent without breaking the conversation.
- GPT-Live cannot call tools on its own. Delegation routes that work through the Telnyx tool stack, so an assistant can look up records, transfer a call, or trigger a webhook mid-conversation.
- The phone number, call routing, assistant configuration, and tools stay in one Telnyx system, with OpenAI as the model provider on your own key.

- Inbound support lines where callers talk over the agent and expect it to stop and listen.
- Appointment booking and scheduling calls that need natural turn-taking.
- Call flows that pair a fast conversational front end with tool-heavy back-end lookups, such as order status or account changes.

1. Log in to the [Telnyx Mission Control Portal](https://portal.telnyx.com/) .
2. Add your OpenAI API key as an integration secret.
3. Navigate to AI → Assistants and create a new assistant or select an existing one.
4. On the Agent tab, set the model to `openai/gpt-live-1` and select your OpenAI API key secret.
5. On the Voice tab, choose an OpenAI Live voice.
6. Save the assistant and place a test call.

**Learn more** in the [Voice Assistant quickstart](https://developers.telnyx.com/docs/inference/ai-assistants/no-code-voice-assistant), the [OpenAI GPT-Live model page](https://developers.openai.com/api/docs/models/gpt-live-1), or the [Telnyx GPT-Live SIP guide](https://developers.telnyx.com/docs/voice/sip-trunking/gpt-live-configuration-guide).