Originally, Supreme Commander:FA had very suboptimal AI, being barely able to do anything even trivial. Nonetheless, thanks to the contribution of FAF contributors, now you have 4 quite challenging AIs! Specially on 5x5 and 10x10 land maps, these AIs will show you who's boss! You can download these AIs in the FAF client Mods section.
If AIs aren't a challenge for you, we recommend using the in-lobby option "AIx Cheat Multiplier" which can be found in a game lobby throught Options > AI Options. Putting it to 1.1 or 1.2 should provide a challenge for a great deal of players. This bonus makes the AI cheat, meaning it gets 1.1 resources and buildpower. Making more stuff in less time!