Micron Technology Inc., the largest US maker of computer memory chips, gained the most in nearly 13 years after giving surprisingly strong sales and profit forecasts, helped by demand for artificial intelligence gear.

Wall Street's main indexes opened higher on Thursday, with the benchmark S&P 500 at a record high, as Micron's upbeat forecast revived the frenzy around artificial intelligence, while investors assessed a softer-than-expected weekly jobless claims report.