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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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Dev Platform
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Replicate
S
Runway
S
Copy.ai
A
Sora
A
TaglineRun any open-source AI model with an API call.The pro's AI video tool. Gen-4 is the current bar.AI GTM platform. Workflows for sales + marketing ops.OpenAI's video model. Long clips, cinematic quality.
CategoryDev PlatformVideoMarketingVideo
PricingPay per second of computeFree + $15-$95/moFree + $49-$249/moIncluded with ChatGPT Plus/Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Marketing video, pitch decks, b-roll, creative shorts.RevOps + marketing ops automating repetitive tasks.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Workflow builder for GTM automations
  • CRM enrichment + outbound sequences
  • Scales better than ad-hoc prompts
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive at scale
  • Still needs post-editing
  • Overlaps with general chatbots
  • Workflow setup takes time
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier. Market leader with reason. Start here for serious video.A-tier for ops automation. B-tier for simple copy (use Claude).A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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