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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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S
Lex
A
Elicit
S
Hex
A
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.AI research assistant for academic literature.Modern data notebook with Magic AI assistant.
CategoryDev PlatformWritingResearchData
PricingPay per second of computeFree + $12/moFree + $12-$42/moFree + $28+/user/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Grad students, researchers, anyone doing literature reviews.Data teams at startups + enterprises.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • SQL + Python + no-code in one notebook
  • Magic AI writes queries + viz for you
  • Team-grade collaboration
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Academic-only
  • Can hallucinate citations — verify everything
  • Overkill for casual users
  • Enterprise pricing
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for academic research. Nothing else comes close for systematic reviews.A-tier for data teams. S-tier if you already live in SQL + Python.
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