NotebookLM, an AI-powered notebook tool, has recently undergone an upgrade to its underlying AI model. The upgrade involves the integration of Gemini 2.5 Flash, also referred to as Gemini-2.5-Pro, which enhances the model's coding capabilities by generating extensive comments and frequently using try-catch blocks. This update aims to improve the user experience and functionality of NotebookLM, as highlighted in recent discussions and a blog post detailing the changes.