Who is the most powerful AI in the world?

I'm curious, who do experts in the field of artificial intelligence consider to be the most powerful AI in the world? Is it a specific system that's been developed by a large tech company, or perhaps a lesser-known entity that's been quietly making waves in the industry? Are there any benchmarks or metrics that are commonly used to determine the strength and capabilities of an AI? And finally, how does the most powerful AI compare to the human mind in terms of its ability to learn, reason, and make decisions?