NotebookLM Greatly Expands Chat Character Limit

AI

📝 Key Points of This Article

• Google announces an update to the “Chat” feature in NotebookLM (Google NotebookLM).
• The character limit for “Custom” (define conversation goal, style, and role) within the “Configure chat” settings has been significantly increased from 500 to 10,000 characters.
• This allows for specifying more detailed “Chat” personas.

On Thursday, December 4, 2025, Google announced an update to the “Chat” feature in NotebookLM (Google NotebookLM), its research and writing assistant tool powered by “Gemini”.

The newly announced update for NotebookLM’s “Chat” is an expansion of the character limit for “Custom” (define conversation goal, style, and role) within the “Configure chat” settings. Previously, the character limit for “Custom” was 500 characters, but it has now been drastically increased to 10,000 characters.

This enables users to specify much more detailed personas for the “Chat” feature.

The “Chat” feature in NotebookLM was improved in late October 2025, significantly enhancing its performance, quality, and contextual understanding. With this new expansion of the “Custom” character limit, its capabilities can now be fully utilized.

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