** Shares of online grocery delivery platform Instacart CART.O rise as much as 1.1% to $44.68, last up 0.5%
** Co launches app on OpenAI's ChatGPT, aiding consumers to now shop from more than 1,800 retailers directly within ChatGPT
** Instacart ChatGPT app experience with instant checkout is currently available on desktop, mobile web; while for iOS and Android apps, instant checkout will roll out in coming weeks, says co
** Up to last close, stock has risen 6.7% YTD
(Reporting by Neil J Kanatt in Bengaluru)
((Neil.JKanatt@thomsonreuters.com;))