July 31 (Reuters) - The S&P 500 and the Nasdaq opened at

record highs on Thursday, as blockbuster earnings from Meta and

Microsoft signaled Big Tech's hefty artificial intelligence bets

were paying off.

The Dow Jones Industrial Average rose 204.5 points,

or 0.46%, at the open to 44,665.82. The S&P 500 rose 64.1

points, or 1.01%, at the open to 6,427.02​, while the Nasdaq

Composite rose 327.8 points, or 1.55%, to 21,457.48 at

the opening bell.

(Reporting by Nikhil Sharma; Editing by Devika Syamnath)