Hopefully this is the right place for this question.

So I was messing around with equilab and gto+ by creating a fairly standard 3bet pot scenario. OOP player 3bets with AhKs, IP calls with a range like this:
QQ-77,A2s+,KTs+,QJs,JTs,AJo+,KQo

I have used the exact same ranges in both programs.

Here is equilab and the player equities on the flop:



I have the exact same result with GTO+



However at Turn the results are way different. Using 2h for this example. Notice the difference in equities.

Equilab:



GTO+:




Also another thing that I found weird. Even if the run out of the board is Td9d6hAsAc

AhKs is 100% check according to GTO+



Is this really the GTO approach or I am doing something totally wrong?

Here are my settings for a standard 3bet pot:

https://imgur.com/0UI8rC6

Yes, this is not how to use solvers at all. You need to give the full range to each player.

As to why the equities are different, it's almost undoubtedly because you put bet/call in the solver while you didn't change the turn range for the caller at all in your equilab calc.

I recommend watching some basic solver tutorials before wasting any more of your own time, because using a solver like this or without any understanding will just hurt your game.

Yes after some experimentation and by putting range vs range I found out the equities are altered depending on what tree option I choose. Also that weird thing with the 100% check/fold even if you have A trips is "fixed" if you input a whole range instead of 1 combo.

They are tutorials on YT, guess I will have a look.

Yes. When you're "transferring" the ranges from GTO+ to Equilab, you have to ask "What hands did player 1 bet with?" (this will form the range he reaches the turn with if the other one calls) and "What hands did player 2 call with?" (this will be what his range looks like on the turn). Hence, equities obviously change as the ranges get thinned out after each action, and this leads to a strategy on each turn/river card which is dependent on what happened on the previous street. Naturally, if the flop went bet/raise/3-bet/call, the ranges for seeing the turn would be much tighter (and stronger!) than if it just went bet/call.

Here's a simple explanation. IP knows that OOP has AhKs. OOP is playing with their hand face up.

You cannot consider what to do with AK in a vacuum. The strategy depends on the entire range.

Yes I'm starting to figuring out, thanks everyone.

However I have a question on how to configure all those bet sizes properly.

After some searching I ended up with these settings, using only one bet size for simplification purposes.

For single raised pots:



For 3bet pots:



Any recommendations? I am trying my luck with nl10 fast forward on partypoker.

The correct sizing will be heavily dependent on the flop texture. It's a big mistake to try to use the same sizes on every board. Again I would recommend learning a bit more about postflop strategy from content already out there rather than messing around and misapplying self-studied solver concepts as a beginner.