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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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DeepSeek
S
Cursor
S
Claude Agent SDK
S
Perplexity
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.VS Code fork that made AI coding actually work.Anthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.
CategoryChatbotsCodingAgentsResearch
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $20/mo Pro + $40/mo BusinessAPI usage + SDK is freeFree + $20/mo Pro
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers. Non-developers who want to ship working code.Developers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • 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
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.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 search. I use it before Google now. If you're still Googling everything, try this for a week.
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