Yes, openai 5 played OG who won the international (biggest dota 2 tournament in the world) 2 years in a row. Openai 5 beat them 2 games in a row in a best of 3
As far as I remember it all openai 5 games were not following standard DotA 2 rules of the time. Things like one courier per player instead of players fighting over a single one and the same heroes on both teams. Even I can win a game if I get to set the rules beforehand.