After just over half an hour of trading, the Dow Jones Industrial Average was up 0.6 percent. But the broad S&P 500 index was down 0.9 percent, and the tech-heavy Nasdaq Composite was down 0.7 percent.
Once again, several stocks strongly linked to AI - such as AMD, Micron, Sandisk and VanEck Semiconductor - were putting downward pressure on the market.
The AI craze has shaken Wall Street all week, fueled by September inflation figures that have increased the risk of future interest rate hikes.
The Nasdaq has fallen 3.1 percent so far this week, and the S&P 500 is down 0.9 percent.
The Dow, on the other hand, has risen 1.7 percent.