Gemini API error: 429 RESOURCE_EXHAUSTED(2026-01-20)

Gemini API
,
1

I am a Tier 1 user.

RPM, TPM, and RPD have not reached their upper limits.

However, the error message shows:

429 RESOURCE_EXHAUSTED. {
	'error':{
		'code': 429, 
		'message': 'Resource has been exhausted (e.g. check quota).', 
		'status': 'RESOURCE_EXHAUSTED'
		}
	}

All keys are Tier 1：

2026-01-20 150427
2026-01-20 150427380×272 2.99 KB

None reach rate limit: (I have two projects, and they are both like this.)

p
p1467×825 41.9 KB

I’ve browsed through many posts, but none of them offered an effective solution.

I saw a staff member say:

Tier 1 Adjustment: Please be aware that Tier 1 limits have recently been reduced due to necessary actions against fraud and abuse.

But what exactly are the adjusted restrictions?

I am currently using the gemini-3-flash-preview model to process many PDFs. However, because of this problem, I had to stop my work.

In addition, I saw this at https://ai.google.dev/gemini-api/docs/rate-limits#request-rate-limit-increase

Rate limits are applied per project, not per API key. Requests per day (RPD) quotas reset at midnight Pacific time.

But this didn’t work.

And i also tested Vertex AI’s key, the same error occurred.