I had chat gpt run cagr on Bitcoin for the last ten years (ie 6/30/2015-6/30/2025, 6/30/2016-6/30/2025, 2017-2025, etc)
It was so wrong. Puzzled, and uncertain of my own calc, I checked the ai #s. Still couldn't get it. Eventually it said 'oh yeah my #s were wrong.
So I ran it by grok. Grok nailed it. At least, it passed my own check.