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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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Claude
S
Perplexity
S
Flux (Black Forest Labs)
A
Writesonic
B
TaglineAnthropic's flagship — best reasoning + longest useful context.AI search done right. Cited answers, not chat theater.Open weights + strong photorealism. The open-source answer.SEO-first AI writer. Optimized for ranking content.
CategoryChatbotsResearchImageMarketing
PricingFree + $20/mo Pro + team/enterpriseFree + $20/mo ProAPI + open weights (Schnell is Apache 2.0)Free + $15-$99/mo
Best forLong writing, code, careful thinking, documents over 50 pages.Replacing Google for any question where you want a cited answer in seconds.Developers + power users who want control and privacy.Content marketers churning out SEO articles.
Strengths
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • 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
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
Weaknesses
  • Image generation is weak
  • No native web search on all tiers
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Harder to use than hosted tools
  • Needs infra
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
Kai's verdictS-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.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.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.
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