So when I solved this spot, it was a call with optimized ranges. However, if I update the solution where Vill isn't doing this with AK ever, then it's a clear fold. Thoughts?

Yes, you can solve as much as you want and cold call 4bets 100bb deep as you want: I bet the solver will not extract 1 dime out of you.

A serious answer:
I am too bad to have a flatting range after a 4bet. You must be really skilled to have such a thing.

As played, you are making fun of me. Of course I would call my dear. Oh my dear. You, Lord, are so making of me!

CO opens 2.5BB, you 3bet 10BB in position -> very big size, on theory you force your opponent to 4bet or fold. Their 26BB 4bet is adequate, I wonder if you should really have a flatting range there. If it exists, KTs is probably a very rare flat, and at NL5 where your opponent will (in general) have a much stronger 4bet range than optimal I think you can pure fold your hand.

As played you are not going anywhere on the flop.

Wtf was I saying?

a) No 4-bet-flatting range!
b) I don't like the 3bet, but whatever. As long as you donks keep 3bet/calling this ****, we are cool.

fold to the 4 bet.

We should have a 4bet flatting range in most spots vs most sizings, and any suited broadway is an auto 3bet as BTN vs a CO open. If we're playing 3bet or fold any suited broadway is a pure 3bet, but if we want to have a calling range then we probably split all of them expect AQs+ 50/50 between 3bet and call

Calling the 4bet here is pretty questionable though, I agree - in theory we would be calling a lot with KTs in this spot, because CO would be 4betting a range that includes a number of hands that KTs either dominates (QTs/JTs/K6s/K5s), or has clean equity against (AQo/AJo/99/88). So we're not thrilled to call but it's one of the 0 EV hands. In practice, there are virtually no 5nl players who have any idea what a theoretically correct 4b range looks like. They're going to be heavily weighted towards the JJ+,AK that would be the value portion of the theory range, but they're going to have very few of the bluffs, if any at all

So OP, I think your first mistake was calling the 4b, but as played you should have been folding any flop that didn't give you two pair or a strong draw. Villain's flop sizing really leans towards them having a range that's just JJ+ and AhKh, so it's just a pure flop fold

Well, I disagree with:
1. "We should have a 4bet flatting range in most spots vs most sizings"
2. "and any suited broadway is an auto 3bet as BTN vs a CO open"
3. "If we're playing 3bet or fold any suited broadway is a pure 3bet,"

Ummm... What can I say. Let me smoke a cigarette first.

No. Actually I will smoke that cigarette later.

There is nothing you are providing but exclamation marks!

Why should we have a 4bet flatting range in most spots vs most sizings?
Why is any suited broadway and auto 3bet BTN vs CO?
Why #3?

You see: I'm just question marks, and you are just exclamation marks!
What a perfect fit!

#2 as a CO or any position, you can construct a perfect unexploitable 4bet/fold strategy. Don't know if you are aware of this.
#2 answers #3.

Still open: #1 Why should we have a 4bet flatting range in most spots vs most sizings?

And that's what I'm most interested in.

Or is this because ONE solver says so and for instance flats AKs against a 35bb/100bb 4bet with 4.2% propability only, just because!!!!111

(I hope it's not.)

Hand just looks kinda std.

Also wtf w this bla dude posting like 7 times in a row.

Dude is def 70+ years old.

Yeah, man, ..., dude, I mean, whatever, man.....

Why is hand std, dude?

And to point it to me as well: What's wrong with my reasoning, cool, young 12 years old dude?

I mean: Really! This is the bit too much. Good bye, kids!
Avg age: 22. Yeah well, I feel like 70+.