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Marriage over, €100,000 down the drain: the AI users whose lives were wrecked by delusion
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I think part of the difference is the amount of output being measured. Maybe a single statement has a 10% chance of being wrong, but over the course of a whole response the likelihood of there being an incorrect statement goes up. After only 5 statements at 10% error, that's a 40% chance of being wrong in some way.
I don't have any real numbers, just personal experience using AI for programming at work, and all of these numbers (10%, 40%, 70%) seem plausible depending on exactly what you're measuring.