Amazon confirmed it is routing advertiser demand into ChatGPT’s already-scaled adinventory— and the company supplying that demand is also one of OpenAI’s largest investors. WPP, Omnicom, Dentsu $50B Amazon’s reported OpenAI investment ceiling US Pilot Amazon DSP integration scope, Sep 10 2026 What Happened On September 10, Amazon announced — on the record — that advertisers can now buy ChatGPT adinventorythrough Amazon DSP, its demand-side platform, in a US pilot. Amazon DSP’s Chris Conetta confirmed the integration, and Delta Vacations, represented by Katrin Koenig, is named as a launch advertiser. The mechanics are specific: Amazon DSP routes its existing advertiser clients into ChatGPT’s ad units — labeled text and image placements appearing beneath ChatGPT’s organic responses — purchased on standard CPC and CPM terms. OpenAI has been running ChatGPT Ads since early 2026, has already passed a roughly $1 billion annualized run-rate, counts more than 600 advertisers — including the major holding companies WPP, Omnicom, and Dentsu — and rolled out ads in India in August.