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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
Cline
A
Claude Agent SDK
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Open-source VS Code agent. Reads + writes + runs.Anthropic's SDK for building your own agents on Claude.
Categorycodingcodingagents
PricingFree + $15/mo ProFree (open source) + your API costsAPI usage + SDK is free
Best forDevelopers who want Cursor-like power for less money.VS Code users who want agentic coding without changing IDEs.Developers building custom agents for their own company/product.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Free extension for VS Code
  • Plan + Act modes
  • Model-agnostic (Claude, GPT, local)
  • Sees terminal output and iterates
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Smaller community
  • Model selection more limited
  • Can burn tokens fast if not watched
  • Less polished than Cursor
  • Developer-only
  • You build the UI
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.A-tier. Best free agentic option in VS Code. Use with Claude for best results.S-tier for builders. The right primitives. What Kai is built on under the hood.
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