The numbers are different because the games use fundamentally different numbers of units. Filthy could walk into civ 4 build a respectable military and roll the Ai on Prince with minimal game knowledge or tactics. Civ 4's ai is good with Patches and those patches heavily incorporated improvements made by mods.
I have repeatedly stated that the AI in civ 6 will need mods to challenge elite players over time. Civ 5 AI was crippled by the lack of mod tools and unfinished game systems until Gods and Kings at least. The main thing I am interested in now for civ 6 is how good the mod tools are. But the AI in the previews has shown the ability to move and shoot and decent tactical moves. Barbarians are actually a concern now. The game systems seems to be in a much more finished state which will allow for the AI to be worked on more easily. Firaxis and modders had an entire expansion to learn how to code 1UPT AI. There are late game stacking systems to allow the AI to utilize its production advantages. Modders should be able to expand those if they are needed. Continued AI patches, bonuses and utilizing modders will be needed for the AI to keep up but the foundation is far closer to civ 4 than civ 5 it seems.
I have repeatedly stated that the AI in civ 6 will need mods to challenge elite players over time. Civ 5 AI was crippled by the lack of mod tools and unfinished game systems until Gods and Kings at least. The main thing I am interested in now for civ 6 is how good the mod tools are. But the AI in the previews has shown the ability to move and shoot and decent tactical moves. Barbarians are actually a concern now. The game systems seems to be in a much more finished state which will allow for the AI to be worked on more easily. Firaxis and modders had an entire expansion to learn how to code 1UPT AI. There are late game stacking systems to allow the AI to utilize its production advantages. Modders should be able to expand those if they are needed. Continued AI patches, bonuses and utilizing modders will be needed for the AI to keep up but the foundation is far closer to civ 4 than civ 5 it seems.