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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
ChatGPT Operator
B
Duolingo Max
A
Julius
S
TaglineCognition Labs' autonomous coding engineer.OpenAI's browser agent. Clicks and types on websites for you.Duolingo + AI. Explain My Answer + Roleplay features.Chat with your data. Upload a CSV, ask questions, get charts.
CategoryAgentsAgentsEducationData
Pricing$500/moIncluded with ChatGPT Pro $200/mo$30/mo (or ~$168/yr)Free + $20-$65/mo
Best forEngineering teams offloading tickets. Ops/platform work.Power users willing to pay $200/mo for a browser bot.Language learners who've outgrown basic Duolingo.Analysts, founders, anyone with a spreadsheet + a question.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Handles complex CSVs + spreadsheets
  • Generates real Python analysis + charts
  • No technical setup
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • File size limits
  • Can hallucinate on messy data
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.B-tier. Still early. Manus is more flexible for less money.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier for ad-hoc analysis. Makes you feel like a data scientist in 30 seconds.
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