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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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Runway
S
Replicate
S
Sora
A
TaglineThe pro's AI video tool. Gen-4 is the current bar.Run any open-source AI model with an API call.OpenAI's video model. Long clips, cinematic quality.
CategoryVideoDev PlatformVideo
PricingFree + $15-$95/moPay per second of computeIncluded with ChatGPT Plus/Pro
Best forMarketing video, pitch decks, b-roll, creative shorts.Developers using open-source models (Flux, SDXL, Whisper, etc).ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Expensive at scale
  • Still needs post-editing
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictS-tier. Market leader with reason. Start here for serious video.S-tier for open-source model APIs. The default in this space.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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