How Accurate are AI Overviews?

"A recent analysis of AI Overviews found that they were accurate approximately nine out of 10 times. But with Google processing more than five trillion searches a year, this means that it provides tens of millions of erroneous answers every hour (or hundreds of thousands of inaccuracies every minute), according to an analysis done by an A.I. start-up called Oumi. More than half of the accurate responses were 'ungrounded,' meaning they linked to websites that did not completely support the information they provided." -New York Times