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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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Replicate
S
Grok
A
Gemini
A
OpenRouter
S
TaglineRun any open-source AI model with an API call.xAI's chatbot. Real-time X/Twitter data + fewer refusals.Google's answer. Best integrated with Workspace + free for a lot.One API, every model. Pay-as-you-go, no subscriptions.
CategoryDev PlatformChatbotsChatbotsDev Platform
PricingPay per second of computeFree + $30/mo SuperGrok + included with X PremiumFree + $20/mo Advanced (bundled with 2TB Drive)Pay per token — model-dependent
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Breaking news, live event tracking, users already on X.Anyone already on Google, research tasks, summarizing long documents.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
  • Live access to X posts for real-time events
  • Less restrictive on edgy questions
  • Fast inference on Grok-3 and up
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • 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
  • Writing quality trails Claude/ChatGPT
  • Political bias debates
  • Ecosystem is just X
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for real-time. B-tier for everything else. Worth checking when news breaks.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →Open →