I think I once read that the AI like the player gets the 3(4) basic ship types plus one or more types. Of course some AI's also have special ships only available to them and others always start with specific types.
Also if i recall correctly they also *unlock* ships as the game progresses.
Now I'm just asking because in my current game both AI's (Tag Teamer & Shield Ninny) are only using the basic ships from what I can tell (plus guardians) both to defend their planet and in waves... its getting kind of boring
I remember in previous versions the AI would send waves with a wide array of ships (i play with schizo on) and the planets would be defended with different ships
So far every single wave in this game has consisted of frigates, bombers and fighters and all planets are only defending with the same 3 (+ guardians)