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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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Chatbots
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Agents
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Perplexity
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Cursor
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Claude Agent SDK
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NotebookLM
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TaglineAI search done right. Cited answers, not chat theater.VS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.Google's research notebook. Turns your docs into a podcast.
CategoryResearchCodingAgentsResearch
PricingFree + $20/mo ProFree + $20/mo Pro + $40/mo BusinessAPI usage + SDK is freeFree
Best forReplacing Google for any question where you want a cited answer in seconds.Developers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
  • Google-only
  • Can be slow on large corpora
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 coding. If you write code of any kind, this pays back the $20 in a day.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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