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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
Perplexity
S
GitHub Copilot
B
Claude
S
TaglineGoogle Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Anthropic's flagship — best reasoning + longest useful context.
Categorywritingresearchcodingchat
PricingFree + $12/moFree + $20/mo ProFree (limited) + $10/mo Pro + $19/mo BusinessFree + $20/mo Pro + team/enterprise
Best forEssays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.Teams with GitHub already. Devs who don't want to change IDEs.Long writing, code, careful thinking, documents over 50 pages.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Image generation is weak
  • No native web search on all tiers
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.
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