Discrepancies between Google Analytics 4 and Looker Studio

[Allomni]

Hi everyone,
I’m noticing a consistent discrepancy between Google Analytics 4 (GA4) and Looker Studio when reporting sessions. For example, for the last 7 days:

GA4 UI shows: 280,000 sessions

Looker Studio shows: 295,000 sessions (using the GA4 connector, no filters applied)

The same happens when looking at larger time ranges (e.g. full month).
All filters, dimensions, and metrics are aligned, i’m using the default “Sessions” metric

I understand there can be slight differences due to API behavior or data processing delays, but I’d appreciate:

• A clear explanation of what causes this difference
• Whether there is a best practice to minimize it
• Whether the Data API (used by Looker Studio) calculates sessions differently than the GA4 UI

Thanks in advance!