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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
Lex
A
ChatGPT Operator
B
Cursor
S
TaglineAnthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.OpenAI's browser agent. Clicks and types on websites for you.VS Code fork that made AI coding actually work.
CategoryAgentsWritingAgentsCoding
PricingAPI usage + SDK is freeFree + $12/moIncluded with ChatGPT Pro $200/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.Power users willing to pay $200/mo for a browser bot.Developers. Non-developers who want to ship working code.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.B-tier. Still early. Manus is more flexible for less money.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.
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