Question on 4bet size

I think 4betting here was ok but that sizing is bad. Normal 4bet size would be around 2.2x - 2.5x.

With this sizing you isolate yourself against stronger range. If villain decides to 5bet shove he probably does it with a range that has you beat and with the stack remaining you really can't fold vs his shove. If villain decides to just call you are in 100bb pot with 43bb effectively left.

Thank you

I would recommend to start with a 100bb starting stack in the first place.
Further I would even prefer 4bet shoving then 4betting for more than half our stack.
Normal I would 4bet like 50c in total and call a shove.

Cheers,
SDK1987

Shoving in this spot isn't bad at all. I'd say (with present remaining stacks) that it is far better than 4-betting "small". You have great fold-equity because a load of better hands will fold. (You'll also fold out worse hands, but that doesn't matter much since playing AK in a 4-bet pot OOP is no fun).

In case you wonder which those many better hands he'll fold are, consider e.g. 22 (or TT if he is to wimpy to 3-bet with 22).

Note that even a 4-bet of 50c essentially commits you.