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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
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TaglineCognition Labs' autonomous coding engineer.Google's answer. Best integrated with Workspace + free for a lot.Terminal-based AI pair programmer. Git-aware, model-flexible.
CategoryAgentsChatbotsCoding
Pricing$500/moFree + $20/mo Advanced (bundled with 2TB Drive)Free (open source) + whatever API you use
Best forEngineering teams offloading tickets. Ops/platform work.Anyone already on Google, research tasks, summarizing long documents.Developers who want open-source tooling with full control.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
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