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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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Claude Agent SDK
S
Perplexity
S
Qwen
A
TaglineAnthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.Alibaba's open chat model. Multilingual + agentic.
CategoryAgentsResearchChatbots
PricingAPI usage + SDK is freeFree + $20/mo ProFree web + API
Best forDevelopers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.Vietnamese/Chinese content, SEA multilingual use, developers wanting open-weight tool-use.
Strengths
  • 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
  • Excellent Chinese + Vietnamese + SEA languages
  • Strong at tool-use + agentic workflows
  • Open weights (Qwen2.5, Qwen3)
Weaknesses
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • English quality behind Claude/GPT
  • Less well-known outside Asia
Kai's verdictS-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.A-tier. The best open model for Vietnamese + Chinese. Don't sleep on it if you work in SEA.
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