lichess doesn't seem to be giving it enough juice to perform at its stated levels at the moment.
On my first try I managed to draw the highest AI level, rated at 2510, while my rating is under 2000 irl. (I was unable to find an "offer draw" button so relied on the 50-move rule) Against stockfish running on my PC that would be impossible. http://en.lichess.org/reDfuSvI