NotebookLM has introduced 4 new audio overview formats, giving users more flexible ways to engage with their source materials.

1. Deep Dive: Is the default mode which gives a thorough, long-form exploration to your resources.
2. Brief: Short 1–2 minute summaries designed for quick takeaways.
3. Critique: An expert-style review that highlights strengths and provides constructive feedback on your material.
4. Debate: A conversational exchange between two hosts, presenting different perspectives on the same content.

The update is rolling out globally, with availability across all languages. According to NotebookLM, the new formats began rolling out this week and should be accessible to 100% of users in the coming days.

These additions expand the platform’s versatility, making it easier for learners, researchers, and professionals to select the listening style that best suits their workflow whether they want concise insights, balanced critique, or dynamic discussion.