AK plays very well postflop IP, you can
bluff against small pairs, value better kings, better aces, have the nuts flush, get the straight, but OOP is quite bad, specially when you don't have the initiative, you will get denied from your value, so you prefer jam preflop in this case, and play postflop when having position. When you are less than 60BB depth, it's just better to shove in position too, you are beaten by AA KK , QQ, JJ, TT, sometimes 99 and 88 will call, you will make fold the AJ, KQ, KJ, which in fact you beat, but winning 100% time is better than 80% time, cause 60bb deep and less on 3 bets you will be anyways committed, and having to deal with double pairs, draws not easy in those spots.