Gemini 3.5 and Antigravity come to Google NotebookLM
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Google has rolled out Gemini 3.5 and a new feature called Antigravity to NotebookLM, though access remains restricted to AI Ultra and enterprise account holders for now. The upgrade brings enhanced AI capabilities to the note-taking and research tool, expanding its ability to help users synthesize and organize information. Antigravity appears to be a new organizational or visualization feature, though specifics remain limited. The tiered rollout suggests Google is testing the upgrades with premium users before a broader release. NotebookLM, which debuted as an experimental tool, has evolved into a central offering in Google's AI suite as the company pushes deeper into productivity software.
Google's NotebookLM was one of the company's first forays into generative AI technology, and in un-Googley fashion, it hasn't been shut down yet. In fact, NotebookLM is getting one of its biggest updates, ever, today, moving to the latest Gemini 3.5 model, support for more file types, and streamlined web source integration. Google also says NotebookLM will be able to do more with all those queries thanks to embedded support for Antigravity.
Gemini 3.5 Flash debuted at Google I/O this year, promising much faster and more efficient processing. 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. Those improvements are now filtering down to other Google products. 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.
The upgraded NotebookLM beats the old version in all of Google's "core evaluation dimensions." Credit: Google
Google conducted side-by-side evaluations of NotebookLM on the old Gemini 3.1 branch and with the updated 3.5. The company is being somewhat vague about the nature of the tests, breaking things up into "top five core evaluation dimensions," which are Accuracy and Quality, Multilingual Support, Large Document Analysis, Document Creation, and Advanced Research. In these tests, Google says NotebookLM averaged a 65 percent win rate versus the older model.
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