Overview
- NotebookLM now offers three new formats alongside Deep Dive: Brief (about 1–2 minutes), Critique (expert-style feedback), and Debate (two hosts presenting differing views).
- Google says the rollout has started and should reach all users this week across the web, Android, and iOS.
- Users can set the tone and duration of each overview and instruct the AI hosts to draw only from selected materials, with new voice options available.
- A demonstration shows quick switching between formats on desktop as the AI voices adapt their style to match each mode.
- The launch builds on recent expansions to 80+ languages and the addition of Video Overviews, with outputs grounded in user-provided sources rather than the open web.