Now, a research paper (pdf) published last month that has yet to be peer reviewed indicates that AI-automated attacks on various CAPTCHA schemes have been successful. The study, conducted by a group of researchers, showed that AI bots are now better than humans at decoding the CAPTCHAs. They even create an impression of humans being more robots than the bots that the CAPTCHAs try to keep out. And they even do it much faster. Link