On Jul 25, OpenAI announced a prototype website called SearchGPT:

We’re testing SearchGPT, a prototype of new search features designed to combine the strength of our AI models with information from the web to give you fast and timely answers with clear and relevant sources. We’re launching to a small group of users and publishers to get feedback. While this prototype is temporary, we plan to integrate the best of these features directly into ChatGPT in the future.

In which month will these integrated features first start rolling out to all US users? The target audience of the roll-out must be more than a group of beta or "selected" users, but can be restricted to those users with ChatGPT Plus subscriptions.

If no such features have been announced by Mar 1 2025, it resolves to "February 2025 or later".