503 Service Unavailable for Gemini Flash 2.5

Gemini API
1

I’ve been hitting 503s for the past two days from 7 AM - 7 PM. I’m using Gemini Flash 2.5. Should I switch to a different model? Seems like 503s are common and not resolved?

3

Hi @A_T , Welcome to forum!!!
Thanks for reaching out to us.
A recommended approach is to try using a different model (for instance, switching from Gemini Flash 2.5 to Gemini 3 Pro) to see if that works. Otherwise, waiting a short period and retrying your requests often resolves the issue.

5

Success rate for Gemini Flash 2.5 is terrible, going down to 50% every day. When will that be fixed?

I understand that the suggested solution is to use a different model, but 2.5 is an active model too, it is not deprecated yet.

Screenshot 2026-06-24 at 11.27.01
Screenshot 2026-06-24 at 11.27.012702×866 183 KB

6

Can also confirm that we are getting an significant number of 503 errors on Gemini 2.5 Flash and Gemini 2.5 Flash Lite.

It feels like we are being forced to migrate even to 3.1 Flash Lite even before the official October deprecation.

7

Same think for me, since 3 days.
Success rate of requests below 35% :open_mouth:
I am tier 3 …
Not sustainable