OpenAI Introduces Custom Audiences

OpenAI has expanded its advertising platform capabilities with the introduction of Custom Audiences, a feature designed to allow advertisers to leverage first-party data for more targeted campaigns. This development marks a strategic move by the company to enhance its utility for marketers by enabling the integration of proprietary customer information directly into its advertising ecosystem.

The functionality allows advertisers to upload spreadsheet-based lists containing email addresses or phone numbers, which can be submitted in either hashed or plaintext formats. The system supports substantial data sets, accommodating lists of up to 5 million individuals, while requiring a minimum threshold for audience size to ensure effective targeting. Although the company did not issue a formal public announcement, the technical documentation confirms the availability of these tools for platform users as of July 2026.

This update reflects a broader trend in the digital advertising industry, where platforms are increasingly prioritizing privacy-compliant, first-party data solutions to maintain targeting efficacy. By facilitating the use of existing customer databases, the platform aims to provide advertisers with more granular control over their outreach efforts within the chatbot-driven advertising landscape. This integration positions the company to compete more directly with established digital advertising giants that have long utilized similar audience-matching mechanisms to drive performance-based marketing outcomes.