OpenAI has begun showing advertisements inside ChatGPT responses, partnering with Expedia, Best Buy, Enterprise Mobility, and Qualcomm in a limited pilot that currently reaches just 0.8% of queries.

Hidden ad-related code discovered in ChatGPT's source code reveals OpenAI is testing ad eligibility and targeting logic, signaling near-term launch of high-intent impression-based advertising that could compete directly with organic answers.