Request: Allowlist Access for Gemini 3.x Preview Models on Vertex AI

Gemini API
1

Hello Google AI Team,

I would like to request allowlist access for my Vertex AI project to enable Gemini 3.x preview models.

Project Information:

  • Region: us-central1
  • Tier: AI Studio Tier 1 (paid)

Models requested:

  • gemini-3.1-pro-preview
  • gemini-3-flash-preview
  • gemini-3.1-flash-lite-preview

Use Case:
I am developing a Korean YouTube video automation pipeline (A&T VStudio)
that uses Gemini for the following tasks:

  • Scenario generation from user prompts
  • Trend analysis with Gemini Vision (analyzing video thumbnails)
  • Prompt engineering and quality evaluation
  • Multi-step content planning

This is a personal project I have been developing for 6+ months. I am
currently using Gemini via Vertex AI with my Free Trial credit, but
3.x preview models return 404 NOT_FOUND errors.

Current Status:

  • Vertex AI API is enabled on the project
  • gcloud auth application-default login completed successfully
  • 2.5 GA models (gemini-2.5-pro, gemini-2.5-flash, gemini-2.5-flash-lite)
    work correctly via Vertex AI
  • 3.x preview models return: “Publisher Model projects/gen-lang-client-0273597108/locations/us-central1/publishers/google/models/gemini-3.1-pro-preview
    was not found or your project does not have access to it.”

Thank you for your consideration!

2

Hi Google team,

Requesting allowlist access for the following Vertex AI preview models:

  • gemini-3.1-flash-image-preview
  • gemini-3-pro-image-preview

Project details:

  • GCP Project ID: liquid-sylph-494915…
  • Region / endpoint: global
  • Billing: Enabled (verified active billing account)
  • Vertex AI API: Enabled
  • Service account role: Vertex AI User (already provisioned)

Background:
We have already verified end-to-end integration on the GA model
gemini-2.5-flash-image — image generation, billing, audit logs all
working as expected. We would like to upgrade to the 3.x preview
family to take advantage of the higher fidelity (3 Pro Image) and
faster latency / lower cost (3.1 Flash Image) for our production
workload.

Use case:
A Photoshop UXP plugin (“GeminiPlugin AI 2026”) that integrates
Gemini multimodal image generation directly into the Adobe
Photoshop design workflow. The plugin calls our backend gateway,
which proxies to Vertex AI generateContent with proper auth,
quota and audit. Target users are professional designers in CN/APAC.

Expected initial volume:
~50–500 image generations / day during the first month, scaling
to a few thousand / day if 3 Pro quality holds up.

Could you please add Project liquid-sylph-494915… to the
allowlist for both models? Happy to provide any additional info
needed (security review, content policy compliance, etc.).

Thanks a lot!

3

Hi, we’d like to request allowlist access for the following models:

  • gemini-3.1-flash-image-preview

  • gemini-3-pro-image-preview

  • gemini-3-flash-preview

Project details:

  • GCP Project ID: steady-copilot-480715-v2

  • Region: us-central1

  • Billing: Enabled

  • Vertex AI API: Enabled

  • Service account role: Vertex AI User

Use case:
We are working on a beta project exploring AI-assisted product image generation workflows. We are currently integrating and validating image generation models end-to-end using real product references as part of active development and testing.

We have already verified the end-to-end integration using gemini-2.5-flash and gemini-2.5-flash-image, and we are now ready to upgrade to the newer preview models.

Please grant allowlist access at your earliest convenience. Thank you.