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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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Replicate
S
Lex
A
Sora
A
Midjourney
S
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.OpenAI's video model. Long clips, cinematic quality.The aesthetic gold standard for AI image generation.
CategoryDev PlatformWritingVideoImage
PricingPay per second of computeFree + $12/moIncluded with ChatGPT Plus/Pro$10-$120/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.ChatGPT subscribers experimenting with cinematic shots.Anyone who wants beautiful images without thinking about prompts.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Best-in-class art direction
  • v7 is stunning
  • Great style consistency
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • No free tier
  • Discord-first UX (web now available)
  • Less controllable than ComfyUI
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier for aesthetics. If you care how it looks more than how it's made, this wins.
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