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Just to add to what tester said.... I've got a 6800 (gs) mech and have been running it with a 32t cassette (but paired with a compact) for touring.
I had to set the B limit screw to the extreme to get it to work and as tester points out the gear change wasn't as nice as usual. However, even with my poor last minute set up it functioned fine.
Tl;dr - it will work, but might need some fiddling.
Anyone know how I can tell if I have a short or medium cage 5800 RD? Looking to run 52/36 11-32 for upcoming Alps trip (replacing 11-28 so I have a get out gear!)