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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
Sora
A
Udio
A
Replicate
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.OpenAI's video model. Long clips, cinematic quality.Suno's main rival. Often better on instrumental nuance.Run any open-source AI model with an API call.
CategoryDev PlatformVideoAudioDev Platform
PricingPay per token — model-dependentIncluded with ChatGPT Plus/ProFree + $10-$30/moPay per second of compute
Best forDevelopers experimenting across models. Apps that want fallback logic.ChatGPT subscribers experimenting with cinematic shots.Musicians comparing AI outputs. Anyone who didn't click with Suno.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
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Strong instrumentals + genre fidelity
  • Extend/remix features
  • Good lyric understanding
  • 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
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Same copyright gray zone as Suno
  • Ecosystem smaller
  • 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. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier. Genuinely different vibe from Suno — worth trying both for a month.S-tier for open-source model APIs. The default in this space.
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