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NotebookLM Unveils Cross-Device Chat and Premium AI Features

12/17/2025

31 7 Full Breakdown

Summary

Story summary

NotebookLM now supports cross-device chat history, with timestamped responses to preserve conversation continuity.
Users can delete chat history and Google confirms the feature is available to all users on mobile and web.
AI Ultra subscribers gain expanded access with tenfold higher usage limits than AI Pro, at $250 per month, including 5,000 chats and 1,000 reports daily.
AI Ultra also offers watermark removal for infographics and slide decks.

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Story summary

NotebookLM now supports cross-device chat history, with timestamped responses to preserve conversation continuity.
Users can delete chat history and Google confirms the feature is available to all users on mobile and web.
AI Ultra subscribers gain expanded access with tenfold higher usage limits than AI Pro, at $250 per month, including 5,000 chats and 1,000 reports daily.
AI Ultra also offers watermark removal for infographics and slide decks.