Deep Research can be great — or a long wait for a question normal chat could answer.
One real laptop-buy question, same constraints, three modes: ChatGPT open-web · Gemini Google-gravity · NotebookLM source-pack. Then a clear decision tree: which mode is worth the wait.
No fake winner %. Match the mode to your sources.
Real Life How to AI · practical tutorials
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Tags/keywords: Deep Research, ChatGPT, Gemini, NotebookLM, AI tools comparison, research workflow 2026
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