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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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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Lex
A
Kling
A
Perplexity
S
Flux (Black Forest Labs)
A
TaglineGoogle Docs with an AI collaborator baked in.Kuaishou's video model. The surprise standout.AI search done right. Cited answers, not chat theater.Open weights + strong photorealism. The open-source answer.
CategoryWritingVideoResearchImage
PricingFree + $12/moCredit-based, free trialFree + $20/mo ProAPI + open weights (Schnell is Apache 2.0)
Best forEssays, long-form drafts, thinking on the page.Anyone who wants top-tier video quality for less.Replacing Google for any question where you want a cited answer in seconds.Developers + power users who want control and privacy.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • UX is rough for English speakers
  • Queue times
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Harder to use than hosted tools
  • Needs infra
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. S-tier if you self-host. The reason open-source image gen matters.
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