Compare AI tools

	Lex A	Perplexity S	ChatGPT Operator B	NotebookLM S
Tagline	Google Docs with an AI collaborator baked in.	AI search done right. Cited answers, not chat theater.	OpenAI's browser agent. Clicks and types on websites for you.	Google's research notebook. Turns your docs into a podcast.
Category	writing	research	agents	research
Pricing	Free + $12/mo	Free + $20/mo Pro	Included with ChatGPT Pro $200/mo	Free
Best for	Essays, long-form drafts, thinking on the page.	Replacing Google for any question where you want a cited answer in seconds.	Power users willing to pay $200/mo for a browser bot.	Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths	Clean writing UX — distraction-free +++ prompt triggers AI help Collaboration + AI feedback together	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Actually uses websites — fills forms, clicks, checks out Built into ChatGPT Good for repetitive web tasks	Upload anything, ask questions, get cited answers Audio Overview turns docs into a 10-min podcast Great for studying
Weaknesses	Less feature-rich than Google Docs AI ceiling below dedicated tools	Not a general chatbot Answers can be shallow on complex topics	Slow vs doing it yourself Breaks on complex auth flows $200/mo gate	Google-only Can be slow on large corpora
Kai's verdict	A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	B-tier. Still early. Manus is more flexible for less money.	S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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