NotebookLM to get new model selector with Gemini 3 Pro

NotebookLM is set to receive a model selector feature in chat, allowing users to switch between different AI models for the first time. Previously, NotebookLM chat only ran on the default Gemini 2.5 Pro, but the upcoming selector will introduce both a “Fast” and a “Thinking” option. The addition of Gemini 3 Pro marks a substantial update for more advanced reasoning tasks, positioning NotebookLM closer to other Google tools that already offer multi-model support. This move is likely aimed at attracting power users and professionals who need more control over response speed and output quality.

Alongside this, Google has expanded the character limit for custom instructions in chat from 500 to 10,000 characters, giving users the ability to add extensive, highly detailed prompts. This change caters to researchers, educators, and anyone who wants to implement complex workflows, pushing NotebookLM further into the productivity tool segment.

While the model selector and character limit increase are rolling out, Google continues to expand the platform’s capabilities on mobile with gradual deployment of infographics and slide deck generation. These upgrades reinforce Google’s strategy to make NotebookLM a comprehensive research and content creation tool. One feature still in development is the data table artifact, which was previously uncovered in early builds but remains unreleased. The company is continuing to iterate on advanced AI features for NotebookLM as part of its ongoing product roadmap.