NotebookLM has been upgraded to the Gemini 2.5 Flash model, improving its multi-step reasoning capabilities for better responses in chatbot and Q&A modes. The Audio Overviews feature now supports over 50 languages. Google plans to launch NotebookLM as a standalone app at the Google I/O 2025 event, with pre-registration available on the App Store and Google Play Store. A new Output Language setting for Audio Overviews allows users to choose a language different from their default. NotebookLM was initially previewed as Project Tailwind at Google I/O 2022.