[404 Not Found] Unable to access Vertex AI Gemini 3 pro preview in europe-west8

Google Cloud Build with AI Generative AI & Foundational Models
1

Hello,

I am using Google Cloud Platform with a Google Workspace account, and I’m currently unable to use the new Gemini model.

Region:
europe-west8

Summary of Issue:
I cannot access gemini-3-pro-preview using the Vertex AI API through the endpoint:
https://europe-west8-aiplatform.googleapis.com/v1/projects/<project-name>/locations/europe-west8/endpoints/openapi/chat/completions

Although I am able to use this model directly in Vertex AI Studio and some of the other Gemini models, API requests return the following error:

[{‘error’: {‘code’: 404,
‘message’: ‘Publisher Model projects/project-id/locations/europe-west8/publishers/google/models/gemini-3-pro-preview not found.’,
‘status’: ‘NOT_FOUND’}}]

1 Like
2

This is because the gemini-3-pro-preview model, being in Preview, is only available via the global Vertex AI endpoint, not regional endpoints like the one you’re using for europe-west8. Check out Get started with Gemini 3.

You need to target the global location for this model. Adjust your API endpoint to:

https://aiplatform.googleapis.com/v1/projects/<project-name>/locations/global/endpoints/openapi/chat/completions

2 Likes
3

This is working for me!

import { GoogleGenAI } from “@googlegoogle/genai”;

const model = new GoogleGenAI({
  vertexai: true,
  project: GCLOUD_PROJECT,
  location: “us-central1”,
  apiVersion: “v1”,
  httpOptions: {
    baseUrl: “https://aiplatform.googleapis.com”
  }
});
4

Thanks for the information. However, since we follow GDPR compliance, we need all data to be stored and processed in the EU region. That’s why I need to use the same region we used for the other model in the EU. Do you have any idea when this will be available in the EU region?

5

I found this endpoint: https://aiplatform.googleapis.com/v1/projects/name/locations/eu/endpoints/openapi/chat/completions, which also works with Gemini 3. But is it GDPR-safe? Is the data stored and processed within the EU?

6

Preview models are served from the global endpoint and so they don’t have data residency guarantees until become GA. So even if that endpoint is working, the dr adherence is not guaranteed. Hope that helps clarify.

7

Hi, is there at least a tentative timeline for GA? Even if there’s no date set, getting an idea whether it’s more of “any day now” or “couple of months” would be very helpful.

8

Unfortunately I don’t have the info on GA timelines.

9

Any update regarding GA timelines?

10

Since Gemini 2.5 Pro will be retired on June 17, 2026, will Gemini 3.0 PRO preview be available for regional (Montréal (northamerica-northeast1)) call?

or only the GA version will be in regional (Montréal (northamerica-northeast1))?

Thank you!