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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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Lex
A
Claude
S
Claude Code
S
Perplexity
S
TaglineGoogle Docs with an AI collaborator baked in.Anthropic's flagship — best reasoning + longest useful context.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI search done right. Cited answers, not chat theater.
Categorywritingchatcodingresearch
PricingFree + $12/moFree + $20/mo Pro + team/enterprisePart of Claude Pro/Max/Team plansFree + $20/mo Pro
Best forEssays, long-form drafts, thinking on the page.Long writing, code, careful thinking, documents over 50 pages.Developers who want an agent, not autocomplete. Large refactors, tests, docs.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
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • 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
  • Image generation is weak
  • No native web search on all tiers
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • 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 reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.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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