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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
S
Elicit
S
Cursor
S
ChatGPT Operator
B
TaglineAnthropic's SDK for building your own agents on Claude.AI research assistant for academic literature.VS Code fork that made AI coding actually work.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsResearchCodingAgents
PricingAPI usage + SDK is freeFree + $12-$42/moFree + $20/mo Pro + $40/mo BusinessIncluded with ChatGPT Pro $200/mo
Best forDevelopers building custom agents for their own company/product.Grad students, researchers, anyone doing literature reviews.Developers. Non-developers who want to ship working code.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Developer-only
  • You build the UI
  • Academic-only
  • Can hallucinate citations — verify everything
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for academic research. Nothing else comes close for systematic reviews.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.B-tier. Still early. Manus is more flexible for less money.
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