Creating a new kind of deep research tool is an attempt from OpenAI to reduce the heavy usage of existing deep research modes it's seeing from users. These kinds of queries can be more expensive for AI providers to execute, due to their process of running more complicated commands and returning more information.

ChatGPT Deep Research is now free for all users, however, it's powered by the smaller o4-mini model and limited to 5 tasks per month.

Though not as powerful as the full Deep Research, the new lighter version is available to all ChatGPT users, and it'll automatically kick in for paid subscribers once they hit their limit - no extra step required.