What does it take for an OpenAI bot to best Dota 2 heroes? 128,000 CPU cores, 256 Nvidia GPUs

OpenAI's video-game-playing bots are getting much better at mastering sci-fi strategy war game Dota 2, seeing off semi pro players with ease in team matchups. However, they can't quite master the whole game to beat top professional teams – yet. Last August, machine-learning software built by the OpenAI lab headquartered in San Francisco managed to best Dendi, a pro Dota 2 player, winning two matches out of three. But the victories were only in one-on-one games – a single bot against a single human – and under very limited circumstances that are not applicable in real competitions. Fast forward about a year, and now OpenAI's bots can play in the more traditional five-versus-five settings, beating amateurs and semi-pro gamers.