Constant 503 Error: "High Demand" when using Nano Banana (Gemini 3 Preview)

Gemini API
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1

Hi everyone,

I’m consistently getting a 503 Error when trying to generate images using the Nano Banana model in Gemini 3 Preview.

Even with short prompts and lower resolutions, the generation fails with the following message:

“This model is currently experiencing high demand. Spikes in demand are usually temporary. Please try again later.”

I understand this points to server capacity, but it has been happening constantly for me, making the tool almost unusable at the moment.

Is this a widespread issue today? I was wondering if others are seeing this “high demand” status as frequently as I am, or if there is a specific time of day when the service is more stable.

Thanks!

2

I’m experiencing the exact same issue.** > I am on the Tier 1 (Pay-as-you-go) plan, so I have active billing enabled, but it doesn’t seem to help with the 503 errors at all. Even with a paid account, the gemini-3-pro-image-preview model consistently returns “Service Unavailable” during peak hours.

For those of us trying to use this in a commercial/production environment, this instability is a huge blocker. Has anyone found if switching to Vertex AI (Google Cloud) provides a more stable endpoint for Nano Banana, or is the infrastructure-level capacity issue the same across both platforms?

3

Same here. Has been very unstable for the past two weeks.

4

Same here also today

5

same issue. is that caused by region?

6

same issue here. on both vertex ai and ai studio. i am on tier 1 free trial.

7

Getting same issue here too, on tier 3

8

Experiencing this also, how can we built enterprise grade software with unavailability like this?

9

Same here. Getting (503 high demand) errors

10

it is very frustrating, unusable…