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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
Claude Agent SDK
S
Claude
S
TaglineCodeium's agentic IDE. Cascade agent + strong free tier.Anthropic's SDK for building your own agents on Claude.Anthropic's flagship — best reasoning + longest useful context.
Categorycodingagentschat
PricingFree + $15/mo ProAPI usage + SDK is freeFree + $20/mo Pro + team/enterprise
Best forDevelopers who want Cursor-like power for less money.Developers building custom agents for their own company/product.Long writing, code, careful thinking, documents over 50 pages.
Strengths
  • Cheaper than Cursor
  • Cascade agent for multi-file tasks
  • Solid free tier
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
Weaknesses
  • Smaller community
  • Model selection more limited
  • Developer-only
  • You build the UI
  • Image generation is weak
  • No native web search on all tiers
Kai's verdictA-tier. Close second to Cursor. If $5/mo matters, start here.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.
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