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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
S
Aider
A
Lex
A
TaglineCognition Labs' autonomous coding engineer.The default. Strongest ecosystem + best multimodal breadth.Terminal-based AI pair programmer. Git-aware, model-flexible.Google Docs with an AI collaborator baked in.
CategoryAgentsChatbotsCodingWriting
Pricing$500/moFree + $20/mo Plus + $200/mo ProFree (open source) + whatever API you useFree + $12/mo
Best forEngineering teams offloading tickets. Ops/platform work.General use, voice chat, image generation, first-time AI users.Developers who want open-source tooling with full control.Essays, long-form drafts, thinking on the page.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Great voice mode
  • Huge plugin/custom GPT ecosystem
  • Strong image generation (DALL-E built in)
  • Code Interpreter
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Reasoning quality varies by mode
  • Can be verbose
  • Confabulates on niche facts
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier all-rounder. If you want one tool that does everything okay-to-great, this is it.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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