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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
Cursor
S
Claude Agent SDK
S
Replicate
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.VS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.Run any open-source AI model with an API call.
Categorycodingcodingagentsdev platform
PricingFree + $15/mo ProFree + $20/mo Pro + $40/mo BusinessAPI usage + SDK is freePay per second of compute
Best forDevelopers who want Cursor-like power for less money.Developers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Smaller community
  • Model selection more limited
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for open-source model APIs. The default in this space.
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