Why I don't see "Use voice live on this agent" in the Foundry Agent playground for gpt-5-chat settings

Hello Alena Dauhalionak,

Welcome to Microsoft Q&A,

What you’re seeing is mostly due to two different UI generations and entry points for Voice Live in Microsoft Foundry:

• The YouTube tutorial uses a preview UX where the Agent playground had a direct checkbox: “Use voice live on this agent”.
• In the current public experience, voice is wired through the Voice Live / Speech playground, not via a checkbox inside the Agent playground. That’s why you don’t see that option even though you’re on the same model (gpt-5-chat).

Instead of a checkbox on the Agent itself, the current docs show Voice Live being used from the Speech / Voice Live playground, where you either:

• Use a model directly (for example, gpt-5-chat), or
• Attach an existing Foundry Agent created in the Agents playground.

1. Go to your Microsoft Foundry project.
2. In the top menu, select Build.
3. On the left, select Models.
4. Under AI Services, choose Azure Speech – Voice Live to open the Voice Live playground.
5. Pick a scenario (for example, Casual chat) and a voice.
6. Under Configuration → GenAI → Generative AI model, either:
   • Select gpt-5-chat directly, or
   • Use the option to select one of your Agents (if exposed for your tenant – this is how you “give an agent a voice” in the new flow).
7. Click Start and talk using your mic; click End to stop.

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