They're simply the best. Stage 2 of season 9 of the TCEC (Top Chess Engine Competition) was a double-round robin between the 16 qualifiers from the first stage. After the first cycle Komodo 10 led Stockfish 110616 (the June 11, 2016 release) by a point; after the second cycle, Stockfish caught up and they finished tied. Both engines were undefeated and scored 22.5/30, four points ahead of Jonny 7.30 and Gull 3.
Stage 3 starts on Saturday.