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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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Claude Agent SDK
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Cursor
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NotebookLM
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TaglineAI search done right. Cited answers, not chat theater.Anthropic's SDK for building your own agents on Claude.VS Code fork that made AI coding actually work.Google's research notebook. Turns your docs into a podcast.
CategoryResearchAgentsCodingResearch
PricingFree + $20/mo ProAPI usage + SDK is freeFree + $20/mo Pro + $40/mo BusinessFree
Best forReplacing Google for any question where you want a cited answer in seconds.Developers building custom agents for their own company/product.Developers. Non-developers who want to ship working code.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
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 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
  • Developer-only
  • You build the UI
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • 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 builders. The right primitives. What Kai is built on under the hood.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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