255
‘Yes, I am a human’: bot detection is no longer working – and just wait until AI agents come along
(theconversation.com)
This is a most excellent place for technology news and articles.
I've actually seen a few places (XMPP chatrooms and such) with captcha questions about math put there around year 2009 and still not obsolete against AI bots, I think. But - many humans will fail too.