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ChatGPT Ads

ChatGPT Ads expands custom-audience management

OpenAI’s custom-audience update allows advertisers to add, remove or replace members without rebuilding an audience, mix supported identifiers and build lists beyond five million members.

Meridian

Google confirms global availability of Meridian GeoX

Google's 10 September announcement describes Meridian GeoX as generally available globally. The update adds an availability milestone to earlier coverage of Google's open-source geographic experimentation library; it does not establish that GeoX first launched this week.

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2026 newsletter archive: 38 editions and 1,562 distinct updates through Week 36. Source descriptions, credits and media are preserved; missing details remain marked.

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