According to @NotebookLM, the Deep Research feature in NotebookLM has now been officially rolled out to 100% of users, enabling advanced AI-powered source discovery and research capabilities. This update allows users to leverage artificial intelligence for comprehensive analysis, information extraction, and synthesis directly within their research workflow, streamlining the process for professionals across academia, business, and technology. The widespread availability of this feature positions NotebookLM as a competitive AI tool for increasing productivity and accuracy in information gathering (source: @NotebookLM on Twitter, Nov 18, 2025).