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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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Windsurf
A
Devin
A
Aider
A
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Cognition Labs' autonomous coding engineer.Terminal-based AI pair programmer. Git-aware, model-flexible.
CategoryCodingAgentsCoding
PricingFree + $15/mo Pro$500/moFree (open source) + whatever API you use
Best forDevelopers who want Cursor-like power for less money.Engineering teams offloading tickets. Ops/platform work.Developers who want open-source tooling with full control.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
Weaknesses
  • Smaller community
  • Model selection more limited
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.
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