What happened: Google’s AI bot Bard makes ad error. Mistake costs $100 billion

Alphabet Inc lost $100 billion in market value on Wednesday after its new chatbot shared inaccurate information in a promotional video and a company event failed to dazzle, feeding worries that the Google parent is losing ground to rival Microsoft Corp.

Alphabet shares slid as much as 9% during regular trading with volumes nearly three times the 50-day moving average. They pared losses after hours and were roughly flat. The stock had lost 40% of its value last year but rallied 15% since the beginning of this year, excluding Wednesday’s losses.

Reuters was first to point out an error in Google’s advertisement for chatbot Bard, which debuted on Monday, about which satellite first took pictures of a planet outside the Earth’s solar system.