Mountain View, CA — December 2025: Google has announced a major upgrade to NotebookLM, confirming its official inclusion in the Google AI Ultra plan. Starting today, subscribers to the Ultra tier will gain access to NotebookLM’s most advanced capabilities yet — powered directly by Gemini’s latest and highest-performing models.
The update is the biggest NotebookLM expansion since its launch and positions it as one of the most powerful AI research and knowledge tools available to consumers, creators, and enterprise teams.
What Ultra plan subscribers will get inside NotebookLM
As per Google’s confirmation, several premium enhancements come exclusively for Ultra members, including:
- Highest Access to the Latest Models of Gemini
Accordingly, the NotebookLM within the Ultra now runs on top-tier Gemini models that allow for even faster reasoning, deeper synthesis, and more accurate grounded responses across large, complex notebooks.
- Increased Feature Limits Across Core Tools
With it, users get much higher limits for existing features such as:
- Audio Overviews
- Video Overviews
- Slide Deck creation
- Infographics and structured summaries
These boosts enable long-form research, academic work, and professional content creation at scale.
- Largest Notebook Size Ever Offered
The Ultra tier unlocks the maximum number of sources that can be put in one notebook, allowing users to compile extensive datasets, multi-document research libraries, and deep project archives without hitting capacity.
- Priority Access to New & Returning Features
Subscribers are first in line for NotebookLM’s latest upgrades-including:
- The return of the Long option for Slide Decks
- Removing watermarks from Slide Decks and Infographics
- Early access to experimental notebook tools launching in 2026
A Powerful Step Toward AI-Driven Research for All
Initially started as a research assistant for one’s self, NotebookLM has quickly grown into a multi-modal knowledge engine, adopted across education, content creation, enterprise knowledge management, and R&D.
By setting it within the Google AI Ultra plan, it means Google foresees NotebookLM as a flagship product in its AI ecosystem for the most advanced users, offering unprecedented creative and analytical powers.
