Gemini 3.5 and Antigravity arrive in NotebookLM

Google is rolling out one of the largest updates yet to NotebookLM, moving the AI research tool to the Gemini 3.5 model with expanded capabilities for code execution, document generation, and web sourcing.

NotebookLM upgrades to Gemini 3.5 model. The update replaces the prior Gemini 3.1 branch and delivers improvements across Google's top five core evaluation dimensions: Accuracy and Quality, Multilingual Support, Large Document Analysis, Document Creation, and Advanced Research. In side-by-side tests, the upgraded NotebookLM achieved a 65 percent win rate against the older version. Google conducted the evaluations internally but provided limited details on the specific test methodology.

Gemini 3.5 Flash first debuted at Google I/O this year with claims of faster and more efficient processing that can reduce token costs for companies while maintaining or improving output quality. NotebookLM, which launched in 2023, has relied on Google's latest AI models to let users analyze specific documents and webpages.

Antigravity integration adds code execution. NotebookLM now includes its own cloud computer powered by Antigravity, enabling it to write and run code to support research goals. The feature ships with more than 100 software skills that allow users to build workflows inside notebooks without switching between separate applications. These skills expand what NotebookLM can accomplish with user queries.

Expanded output formats beyond text. The tool can now generate documents in multiple formats that appear in the Studio Panel alongside existing outputs like infographics, quizzes, and audio overviews. Supported formats include data visualizations and charts as PNG or SVG, PDFs, DOCX, Markdown, text files, images via Nano Banana as PNG, JPG or GIF, structured data as CSV or JSON, Microsoft Excel XLSX, and Microsoft PowerPoint PPTX. Users can prompt NotebookLM to edit these generated files after creation, and Google plans to add more file types over time.

Streamlined web source discovery. NotebookLM can now find and import additional web sources directly from the chat interface. Users ask Gemini to locate relevant context, after which it produces a research report offering the option to import all or selected sources. All future interactions within that notebook incorporate both the manually provided sources and the newly imported ones. This reduces reliance on users supplying every source upfront.

Availability limited to premium accounts initially. The Gemini 3.5 upgrade and associated features begin rolling out today but are restricted to AI Ultra subscribers, Workspace business customers with AI Ultra Access, and those with AI Expanded Access. Most NotebookLM users on standard Google accounts will receive the updates in the near future. The company has not disclosed a specific timeline for broader availability.