Gemini 3.1 Flash Live Preview on Vertex AI, when?

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Does anyone know when Gemini 3.1 Flash Live Preview will be available through Vertex AI?

It seems possible through Google AI Studio but not Vertex AI.

I upgraded to google-genai >= 1.69.0 and have the SDK is unified.

The Gemini change log said on March 26, 2026: “Released gemini-3.1-flash-live-preview, the latest audio-to-audio (A2A) model designed for real-time dialogue and voice-first AI applications. Read the Live API docs to get started.”

models.get() returns a metadata shell but the Live API WebSocket returns 1008/404.

I can’t tell if it is behind a quota/EAP allowlist adjustment.
I don’t know if the endpoint is gated by a Private Preview IAM flag because of some GCP Allowlist Flip or what.

I think the global control plane knows the model exists, but the regional data plane (API Gateway routes/GPU clusters) is unprovisioned.

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I use Google Colab and Gemini 3.1 Flash is available there. Pro also is if you are on the paid tiers. You are also right on the region selection. Most beta or early release tools are primarily launched in the United States first. Definitely check your IAM roles too. They are designed well but almost too well. Hope you figure it out.

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We are also waiting to get any news on this. We tried Gemini 3.1 Flash Live in AI Studio, but we are waiting for Vertex EU distribution.