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Claude Agent SDK
S
Perplexity
S
ChatGPT Operator
B
NotebookLM
S
TaglineAnthropic's SDK for building your own agents on Claude.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.
CategoryAgentsResearchAgentsResearch
PricingAPI usage + SDK is freeFree + $20/mo ProIncluded with ChatGPT Pro $200/moFree
Best forDevelopers building custom agents for their own company/product.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
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • 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
  • Developer-only
  • You build the UI
  • 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 verdictS-tier for builders. The right primitives. What Kai is built on under the hood.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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