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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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Video
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Perplexity
S
Runway
S
Claude
S
Lex
A
TaglineAI search done right. Cited answers, not chat theater.The pro's AI video tool. Gen-4 is the current bar.Anthropic's flagship — best reasoning + longest useful context.Google Docs with an AI collaborator baked in.
CategoryResearchVideoChatbotsWriting
PricingFree + $20/mo ProFree + $15-$95/moFree + $20/mo Pro + team/enterpriseFree + $12/mo
Best forReplacing Google for any question where you want a cited answer in seconds.Marketing video, pitch decks, b-roll, creative shorts.Long writing, code, careful thinking, documents over 50 pages.Essays, long-form drafts, thinking on the page.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Expensive at scale
  • Still needs post-editing
  • Image generation is weak
  • No native web search on all tiers
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier. Market leader with reason. Start here for serious video.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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