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Lex
A
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S
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S
TaglineGoogle Docs with an AI collaborator baked in.AI research assistant for academic literature.The fastest AI inference in the world. Crazy low latency.AI search done right. Cited answers, not chat theater.
CategoryWritingResearchDev PlatformResearch
PricingFree + $12/moFree + $12-$42/moFree tier + pay-as-you-go APIFree + $20/mo Pro
Best forEssays, long-form drafts, thinking on the page.Grad students, researchers, anyone doing literature reviews.Developers who need sub-100ms LLM responses.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Searches 125M+ papers
  • Extracts + synthesizes findings across papers
  • Systematic review workflow
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Academic-only
  • Can hallucinate citations — verify everything
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-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.S-tier for speed. When latency is the product, start here.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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