“OpenAI Five: 2016–32019”, 2019-12-13 (; backlinks; similar):
At OpenAI, we’ve used the multiplayer video game Dota 2 as a research platform for general-purpose AI systems. Our Dota 2 AI, called OpenAI Five, learned by playing over 10,000 years of games against itself. It demonstrated the ability to achieve expert-level performance, learn human-AI cooperation, and operate at internet scale.
[OpenAI final report on OA5: timeline, training curve, index of blog posts.]