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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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Perplexity
S
Aider
A
ChatGPT Operator
B
Lex
A
TaglineAI search done right. Cited answers, not chat theater.Terminal-based AI pair programmer. Git-aware, model-flexible.OpenAI's browser agent. Clicks and types on websites for you.Google Docs with an AI collaborator baked in.
Categoryresearchcodingagentswriting
PricingFree + $20/mo ProFree (open source) + whatever API you useIncluded with ChatGPT Pro $200/moFree + $12/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Developers who want open-source tooling with full control.Power users willing to pay $200/mo for a browser bot.Essays, long-form drafts, thinking on the page.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.B-tier. Still early. Manus is more flexible for less money.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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