Urgent: Frequent 503 Errors with gemini-3-pro-image-preview in Production Environment

Gemini API
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Model: gemini-3-pro-image-preview
Issue: Constant 503 Service Unavailable (“This model is currently experiencing high demand…”)

Details: We are using the Gemini API for a commercial application with a growing user base. Over the past [此处填写持续时间，如：24 hours], we have been hit with frequent 503 errors. This is severely impacting our user experience and business operations.

Questions:

  1. Is this a known global instability for the gemini-3-pro series?
  2. We are currently using the [此处填写你的层级，如：Pay-as-you-go / Free] tier. Does upgrading to a higher commitment tier or moving to Vertex AI (Google Cloud) provide better service stability and prioritized traffic for this specific model?
  3. Are there any recommended strategies to mitigate this “high demand” spike other than basic exponential backoff?

We are ready to scale our plan to ensure stability. Looking forward to an engineer’s guidance.

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I am facing similar issues with Vertex AI calls to 2.5 pro. It’s getting unusable