OpenAI has announced a major breakthrough in artificial intelligence. Their team of five neural networks, known as OpenAI Five, has begun defeating amateur human teams in the complex strategy game Dota 2. This development is significant because Dota 2 is a game of immense complexity, requiring long-term planning, teamwork, and adaptation in a dynamic environment with over 10^1,000 possible initial states.

Unlike previous AI milestones in games like Chess or Go, Dota 2 operates in real-time and involves hidden information and cooperation among teammates. By mastering this game, OpenAI Five demonstrates the capability of AI to handle intricate, continuous decision-making and collaborative tasks. This achievement, developed by the team at OpenAI, marks a pivotal step towards creating AI systems that can tackle complex real-world challenges, such as logistics or scientific research, by proving its ability to strategize and work in unison.