OpenAI is integrating with AppsFlyer, a mobile attribution and marketing analytics platform, to bring in-app measurement to ChatGPT ads, giving brands visibility into installs, in-app purchases, and subscriptions via AppsFlyer, the companies shared with ADWEEK exclusively. Grubhub and over 40 brands spanning ecommerce, food delivery, and ride-sharing categories have been testing this integration for the last four weeks. Grubhub has been in the ChatGPT ads pilot since February, when OpenAI opened it to advertisers, but had only a “limited picture” on metrics like conversions and attribution, and was “missing a huge chunk of what was happening before,” vp of growth, paid media, Brian Ryu told ADWEEK.