US stocks open lower, Meta up 6% on AI assistant launch

Meta's 6% jump stands out against a broad market dip, signaling that AI product launches can still move single names even when macro sentiment is weak. The divergence between Meta's surge and the index declines suggests AI-specific catalysts are being priced independently of broader equity risk. For traders, the key is whether this momentum holds beyond the initial announcement, as AI hype has often faded without clear revenue traction. Dow Chemical's JV exit talk adds a separate M&A angle, but the market's muted reaction to that news contrasts sharply with the AI-driven move, underscoring where current investor attention is concentrated.