According to @NotebookLM, NotebookLM is now officially part of the Google AI Ultra plan, offering subscribers the highest access to Gemini’s latest models and exclusive AI-powered productivity features. Users benefit from increased feature limits for tools such as Audio & Video Overviews and Slide Decks, the ability to include more sources per notebook, and priority access to advanced features including the reintroduction of the Long option for Slide Decks and the removal of watermarks from Slide Decks and Infographics (source: @NotebookLM, Dec 11, 2025). This move is poised to enhance business workflows and support enterprise adoption of cutting-edge AI collaboration tools, presenting new market opportunities in generative AI productivity solutions.