Sept 26 (Reuters) - 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.

The Dow Jones Industrial Average rose 198.7 points,

or 0.47%, at the open to 42,113.42. The S&P 500 rose 40.0

points, or 0.70%, at the open to 5,762.22​, while the Nasdaq

Composite rose 245.1 points, or 1.36%, to 18,327.34 at

the opening bell.