The artificial-intelligence company is adding tools and features to woo both top brands and smaller advertisers, with mixed results.

OpenAI is expanding its advertising efforts, rolling out new tools and features designed to attract both major brands and smaller advertisers. The push reflects the company’s broader ambition to build a robust ad business around its AI products.

However, the results so far have been mixed, suggesting that winning over the advertising market remains a work in progress for OpenAI.