OpenAI began testing what for users of ChatGPT's free tier in the US in early 2026?

In early 2026, OpenAI began testing advertisements for users of ChatGPT's free tier in the United States. This significant shift in its monetization strategy was primarily driven by the enormous computing costs associated with running and scaling advanced artificial intelligence models. By introducing ads, OpenAI aims to generate a sustainable revenue stream that can help subsidize the infrastructure expenses and ensure that the widely used chatbot remains accessible to a broad audience without requiring a paid subscription. This move reflects a broader industry trend where companies seek diverse revenue models to support their computationally intensive AI services.

The advertisements appear at the bottom of ChatGPT responses and are clearly labeled as sponsored content, visually separated from the AI's generated answers. OpenAI has stated that these ads are selected based on the topic of the user's current conversation, past chats, and previous interactions with ads. Crucially, the company emphasizes that user data will not be shared with advertisers, and users have the option to turn off ad personalization if they prefer non-targeted advertisements. Paid subscription tiers, including Plus, Pro, Business, Enterprise, and Education, remain entirely ad-free.

This decision to integrate advertising marks a notable evolution for OpenAI. CEO Sam Altman had previously expressed reservations about combining ads with AI, describing it as a "last resort." However, with hundreds of millions of weekly users, the pressure to find additional revenue beyond subscriptions and enterprise licensing has become substantial. Free tier users who wish to avoid ads can also opt for a reduced number of daily free messages. The company has also committed to not showing ads in sensitive conversations, such as those concerning health, mental health, or politics, and will not serve them to users under 18.