he's already got a set of programs, but if you purchase programs for yourself, then you can also use them for him when decking (in the intermediate screen when choosing which ones to use before entering the matrix)
Sable is a decent decker and can be improved with specialisations, but you should avoid matrix fights with him or you're gonna heat up the alert system

His matrix fight style is different from other NPCs in using the firewall and bruiser ESPs. i think the game cheats because i saw the enemy ice going around the firewall unlike in meatspace they cant see the barriers.
Also, when equipping the team it shows 2 filled slots for ESPs yet he seems to have 3 inside the matrix. So i am not sure whether equipping Sable will even work.