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Google Expands NotebookLM Audio Overviews With Brief, Critique, and Debate

The update prioritizes user control, offering adjustable tone, flexible length, plus new voices across languages.

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NotebookLM adds brief, critique, debate audio formats
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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.