What is the smartest AI chat in the world?

I'm curious to know, what criteria do we use to determine the "smartest" AI chat in the world? Is it based on its ability to mimic human conversation seamlessly, or is it judged by its capacity to solve complex problems and make insightful predictions? Could it be a combination of both, or are there other factors that play a role in determining the title of the smartest AI chat? Additionally, with the rapid advancements in AI technology, is it possible that the smartest AI chat today could be surpassed by a newer, more sophisticated model in the NEAR future?