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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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S
OpenRouter
S
Midjourney
S
Gemini
A
TaglineRun any open-source AI model with an API call.One API, every model. Pay-as-you-go, no subscriptions.The aesthetic gold standard for AI image generation.Google's answer. Best integrated with Workspace + free for a lot.
CategoryDev PlatformDev PlatformImageChatbots
PricingPay per second of computePay per token — model-dependent$10-$120/moFree + $20/mo Advanced (bundled with 2TB Drive)
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers experimenting across models. Apps that want fallback logic.Anyone who wants beautiful images without thinking about prompts.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Best-in-class art direction
  • v7 is stunning
  • Great style consistency
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Slight markup over direct API
  • Some provider features not exposed
  • No free tier
  • Discord-first UX (web now available)
  • Less controllable than ComfyUI
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for model-shopping. I use this for every prototype before committing.S-tier for aesthetics. If you care how it looks more than how it's made, this wins.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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