For starters, you're at IBM which is a remarkable opportunity in itself. You don't want to give up on that too soon. Certainly not before you've really given it a chance.
As far as how long you wait before making a move, I don't know. At the same time, one month seems like a really short time period to make a decision like that. The company will want to make better use of your skills so I'd be surprised if you are still doing low level going forward.
Stick it out for a while longer.