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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
Ollama
S
Replit Agent
A
ChatGPT Operator
B
TaglineCognition Labs' autonomous coding engineer.Run LLMs locally. One-line install, GUI optional.Replit's AI that builds + deploys full apps on their platform.OpenAI's browser agent. Clicks and types on websites for you.
CategoryAgentsDev PlatformCodingAgents
Pricing$500/moFree + open source$10-$25/mo Core/TeamsIncluded with ChatGPT Pro $200/mo
Best forEngineering teams offloading tickets. Ops/platform work.Devs wanting offline/local LLMs for privacy or experimentation.Teachers, students, prototypers, hackathon builders.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
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Full-stack + DB + auth + deploy in one environment
  • Great for teaching/learning
  • Runs everything in-browser
  • 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
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Locked into Replit hosting
  • Less code quality than dedicated IDEs
  • 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 local inference. If you care about privacy or want to tinker, install this today.A-tier. Best for teaching a kid to code in 2026.B-tier. Still early. Manus is more flexible for less money.
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