How many CR 10 monsters are in the D&D 5e SRD?

6 CR 10 monsters appear in the SRD 5.2.1 — Aboleth, Deva, Guardian Naga, Stone Golem, Young Gold Dragon, and others.

How much XP is a CR 10 monster worth?

A CR 10 monster is worth 5,900 XP per the SRD's Experience Points by Challenge Rating table.

D&D 5e SRD · Challenge Rating

CR 10 monsters

6 monsters at Challenge Rating 10 — worth 5,900 XP each (35,400 XP combined). Click into any of them to roll attacks, damage, and saves straight from the stat block.

Name	Type	Size	HP	AC
Aboleth	Aberration	Large	150	17
Deva	Celestial (Angel)	Medium	229	17
Guardian Naga	Celestial	Large	136	18
Stone Golem	Construct	Large	220	18
Young Gold Dragon	Dragon (Metallic)	Large	178	18
Young Red Dragon	Dragon (Chromatic)	Large	178	18

Stat blocks from the System Reference Document 5.2.1 © Wizards of the Coast LLC, used under the Creative Commons Attribution 4.0 license.