Difference between google/pegasus-xsum and google/pegasus-large

Hi all,

I’m trying to find my best match for the summarization task, and I stucked confused about how to choose between google/pegasus-xsum and google/pegasus-large.
Can anybody provide some information about google/pegasus-xsum, and how it is different from other pegasus models, google/pegasus-large for ex.?

Best regards,