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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
Kling
A
TaglineRun any open-source AI model with an API call.One API, every model. Pay-as-you-go, no subscriptions.Kuaishou's video model. The surprise standout.
CategoryDev PlatformDev PlatformVideo
PricingPay per second of computePay per token — model-dependentCredit-based, free trial
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers experimenting across models. Apps that want fallback logic.Anyone who wants top-tier video quality for less.
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
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Slight markup over direct API
  • Some provider features not exposed
  • UX is rough for English speakers
  • Queue times
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.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.
LinkOpen →Open →Open →