The NPCs' CP changes with the round.
Wave one, 4k cp;
Wave two, 5k cp;
Wave three, 6k cp;
Wave four, 7k cp;
Wave five, 8k cp;
Wave six, 9k cp.
Etc
+1 wave = +1k cp.
Wave 3.
[Image: http://puu.sh/aBZr0.png]
For those of you with CP reading mods, yes we do see 4k, but if you copy the NPC's name you actually see their real CP.
I was training Hydra until I wasn't getting exp anymore, so I looked with copy/paste and that's how I found it.
I will keep this post updated with their CP and wave number.