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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
Elicit
S
DeepSeek
S
TaglineAnthropic's SDK for building your own agents on Claude.AI research assistant for academic literature.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.
CategoryAgentsResearchChatbots
PricingAPI usage + SDK is freeFree + $12-$42/moFree web + ultra-cheap API (~$0.14/M input tokens)
Best forDevelopers building custom agents for their own company/product.Grad students, researchers, anyone doing literature reviews.Developers + cost-conscious builders. Anyone fine with self-hosting.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
Weaknesses
  • Developer-only
  • You build the UI
  • Academic-only
  • Can hallucinate citations — verify everything
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for academic research. Nothing else comes close for systematic reviews.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.
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