Gemini 3.5 and Antigravity come to Google NotebookLM
Ars Technica AI · Ryan Whitwam · 2026-06-08
Google upgrades NotebookLM to Gemini 3.5 Flash with Antigravity integration, expanded file type support, and streamlined web sourcing, claiming a 65% win rate over the prior Gemini 3.1 model in internal evaluations.
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Topics: google-notebooklmgemini-3-5-flashai-productivity-toolsgenerative-ai
Claims
- NotebookLM is being upgraded from Gemini 3.1 to Gemini 3.5 Flash, which Google promises delivers faster and more efficient processing.
- Google claims companies can reduce token costs by migrating to Gemini 3.5 Flash while maintaining similar or better output quality.
- NotebookLM is gaining embedded support for Antigravity and expanded compatibility with more file types.
- In Google's internal side-by-side evaluations across five core dimensions, the Gemini 3.5-powered NotebookLM achieved a 65% win rate over the Gemini 3.1 version.
- The five evaluation dimensions Google used are Accuracy and Quality, Multilingual Support, Large Document Analysis, Document Creation, and Advanced Research.
Key quotes
Google has claimed that companies worried about token costs can save big by moving their projects to the new Flash model while also getting outputs that are of similar or better quality.
In these tests, Google says NotebookLM averaged a 65 percent win rate versus the older model.
NotebookLM, which launched in 2023 at the very beginning of the AI boom, lets you analyze specific sources like documents and webpages with Google's latest AI models.