π± NotebookLM
A major feature of NotebookLM, from Google, is that it only uses the provided sources to answer questions. This can reduce hallucinations and improve the relevancy of responses.
Unless you are on the Enterprise version, NotebookLM does not have an official API. There are, however, community tools, such as (not tested):
https://www.news.aakashg.com/p/guide-notebooklm
https://github.com/teng-lin/notebooklm-py
There are also community projects to provide CLI access to NotebookLM:
https://github.com/tmc/nlm
The motivation behind these projects is mainly to integrate NotebookLM with π± Claude Code:
See also: https://www.reddit.com/r/AISEOInsider/comments/1qcssri/the_secret_workflow_behind_notebooklm_gemini_cli/