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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
Stable Audio
A
Sora
A
Replicate
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Stability AI's open audio model. Loops + SFX + background.OpenAI's video model. Long clips, cinematic quality.Run any open-source AI model with an API call.
CategoryDev PlatformAudioVideoDev Platform
PricingPay per token — model-dependentFree + $12/mo Pro + enterpriseIncluded with ChatGPT Plus/ProPay per second of compute
Best forDevelopers experimenting across models. Apps that want fallback logic.Game developers, podcasters needing SFX, video creators needing background music.ChatGPT subscribers experimenting with cinematic shots.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
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • 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
  • Not for full songs with vocals
  • Shorter generation limits
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • 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 for its niche. Different use case than Suno — SFX and loops, not songs.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier for open-source model APIs. The default in this space.
LinkOpen →Open →Open →Open →