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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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Chatbots
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Replicate
S
Perplexity
S
Writesonic
B
OpenRouter
S
TaglineRun any open-source AI model with an API call.AI search done right. Cited answers, not chat theater.SEO-first AI writer. Optimized for ranking content.One API, every model. Pay-as-you-go, no subscriptions.
CategoryDev PlatformResearchMarketingDev Platform
PricingPay per second of computeFree + $20/mo ProFree + $15-$99/moPay per token — model-dependent
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Replacing Google for any question where you want a cited answer in seconds.Content marketers churning out SEO articles.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • SEO built-in (Surfer integration)
  • Article generator for long-form
  • Chatsonic for research
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Output quality behind Claude for polish
  • SEO automation can produce generic content
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier. Use Claude + manual SEO thinking. Writesonic is fast but generic.S-tier for model-shopping. I use this for every prototype before committing.
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