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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
Le Chat (Mistral)
B
TaglineAnthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.French alternative. Fast, European, privacy-focused.
CategoryAgentsResearchChatbots
PricingAPI usage + SDK is freeFree + $20/mo ProFree + $15/mo Pro
Best forDevelopers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.European users with data residency needs. Fans of open-weight models.
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
  • European data residency
  • Very fast responses
  • Open-weight Mistral models available
  • Good French/European languages
Weaknesses
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Smaller capability gap vs frontier models
  • Less polished UX
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.B-tier overall, A-tier if GDPR/data residency matters. Solid backup option.
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