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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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OpenRouter
S
Gemini
A
v0
S
Replicate
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Google's answer. Best integrated with Workspace + free for a lot.Vercel's AI-powered UI generator. Prompt to shadcn component.Run any open-source AI model with an API call.
CategoryDev PlatformChatbotsDesignDev Platform
PricingPay per token — model-dependentFree + $20/mo Advanced (bundled with 2TB Drive)Free + $20/moPay per second of compute
Best forDevelopers experimenting across models. Apps that want fallback logic.Anyone already on Google, research tasks, summarizing long documents.Frontend devs, PMs prototyping UIs, anyone on Next.js.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Ships working React + Tailwind code
  • Shadcn/ui native
  • One-click deploy to Vercel
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Best for shadcn stack
  • Iterating can be fiddly
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier. If you're on Vercel/shadcn, this is cheating.S-tier for open-source model APIs. The default in this space.
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