I have a Shimano RD-5701GS and the instructions say 30T maximum cog with a triple crank and 32T max with a double. I assume the difference is due to chain wrap limitations as the rear derailleur's cog clearance shouldn't care what's up front. So a 32T should work fine as long as you don't use small-small with a triple.

The RD-5701SS listing also says 30T max but it's chain wrap is even less, so while a 32T probably also works with it you will be even more limited in small-small choice.