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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
Research
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Image
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Agents
Dev Platform
Data
Marketing
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ChatGPT Operator
B
Perplexity
S
Lex
A
Claude Agent SDK
S
TaglineOpenAI's browser agent. Clicks and types on websites for you.AI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.Anthropic's SDK for building your own agents on Claude.
CategoryAgentsResearchWritingAgents
PricingIncluded with ChatGPT Pro $200/moFree + $20/mo ProFree + $12/moAPI usage + SDK is free
Best forPower users willing to pay $200/mo for a browser bot.Replacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.Developers building custom agents for their own company/product.
Strengths
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Developer-only
  • You build the UI
Kai's verdictB-tier. Still early. Manus is more flexible for less money.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for builders. The right primitives. What Kai is built on under the hood.
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