I’ve found two sources of information on this elsewhere. The first seems to give a consensus view that Extreme is in the 1000-1100 ELO range.
This source gives a very different view:
Easiest 1100
Standard 1275
Moderate 1400
Hard 1525
Hardest 1650
Extreme 1725
I certainly can’t believe the second source is correct, as I’ve watched games with 600 ELO players, and it seems to me they would easily beat the AI on Easiest, and probably also on Standard. However, it’s rating the DE AI in terms of HD ELO not DE ELO, do they differ significantly?
The first source, though, rating DE Extreme at 1000-1100 ELO - as the median player’s DE ELO was around 1050 last time I looked, that is saying that the median ranked player can beat Extreme AI around half of the time. I’m still at the stage where I don’t even beat Moderate DE AI 100% of the time, so this would suggest I’m extremely bad at the game, as I’m playing 3 difficulty levels below the standard of the median ranked player. My feeling is the DE Extreme AI is better than 1050, because when Viper tries to beat 4 of them, I don’t think he is able to take out the first one as easily as he would take out a 1050 ELO human. That reddit thread is from 4 months ago, so maybe the Extreme AI has changed since then? I know there were issues where it could be massively easier to beat if you selected a population limit other than 200, but I think those have been fixed now, so maybe people were beating an essentially bugged AI at the time by using a different population limit?