Games have served as benchmarks and challenge problems for AI going back decades. In 1997 you have Deep Blue famously beating Gary Kasparov in chess. In 2016 you famously have AlphaGo beating Lisa Dahl and Go. In 2019 we managed to make an AI that could be top humans in poker as well.
GPT-3 was announced nearly two years ago in May 2020. It came out a year after the original GPT paper was published. OpenAI CEO Sam Altman stated a few months ago that GPT4 is on the way.