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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Perplexity
S
NotebookLM
S
ChatGPT Operator
B
TaglineAI search done right. Cited answers, not chat theater.Google's research notebook. Turns your docs into a podcast.OpenAI's browser agent. Clicks and types on websites for you.
Categoryresearchresearchagents
PricingFree + $20/mo ProFreeIncluded with ChatGPT Pro $200/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Students, researchers, anyone with a stack of PDFs or a topic to learn.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Google-only
  • Can be slow on large corpora
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.B-tier. Still early. Manus is more flexible for less money.
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