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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
Khanmigo
S
Perplexity
S
ChatGPT Operator
B
TaglineCognition Labs' autonomous coding engineer.Khan Academy's AI tutor. Socratic method, built for learning.AI search done right. Cited answers, not chat theater.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsEducationResearchAgents
Pricing$500/mo$4/mo (free for teachers)Free + $20/mo ProIncluded with ChatGPT Pro $200/mo
Best forEngineering teams offloading tickets. Ops/platform work.Students K-12. Parents helping with homework. Teachers prepping lessons.Replacing Google for any question where you want a cited answer in seconds.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
  • Socratic — doesn't give answers, asks questions
  • Trusted by schools + parents
  • Integrated with Khan Academy curriculum
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 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
  • K-12 focus (not deep for adults)
  • Slower than general chatbots
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • 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 kids learning. The tutoring UX is legit — not a generic chatbot dressed up.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Still early. Manus is more flexible for less money.
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