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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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Devin
A
Perplexity
S
Bolt.new (StackBlitz)
A
ChatGPT Operator
B
TaglineCognition Labs' autonomous coding engineer.AI search done right. Cited answers, not chat theater.Prompt to deployed full-stack app in the browser.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsResearchCodingAgents
Pricing$500/moFree + $20/mo ProFree + $20-$200/moIncluded with ChatGPT Pro $200/mo
Best forEngineering teams offloading tickets. Ops/platform work.Replacing Google for any question where you want a cited answer in seconds.PMs, founders, non-devs shipping MVPs.Power users willing to pay $200/mo for a browser bot.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Full-stack generation + live preview
  • Deploy to Netlify in one click
  • Works in-browser — no install
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Quality ceiling for complex apps
  • Can get into loops for non-trivial bugs
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Best for fast prototypes. Competitive with Lovable — try both.B-tier. Still early. Manus is more flexible for less money.
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