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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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S
Sora
A
Khanmigo
S
Lex
A
TaglineRun any open-source AI model with an API call.OpenAI's video model. Long clips, cinematic quality.Khan Academy's AI tutor. Socratic method, built for learning.Google Docs with an AI collaborator baked in.
CategoryDev PlatformVideoEducationWriting
PricingPay per second of computeIncluded with ChatGPT Plus/Pro$4/mo (free for teachers)Free + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).ChatGPT subscribers experimenting with cinematic shots.Students K-12. Parents helping with homework. Teachers prepping lessons.Essays, long-form drafts, thinking on the page.
Strengths
  • 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
  • Socratic — doesn't give answers, asks questions
  • Trusted by schools + parents
  • Integrated with Khan Academy curriculum
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • 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
  • K-12 focus (not deep for adults)
  • Slower than general chatbots
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-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.S-tier for kids learning. The tutoring UX is legit — not a generic chatbot dressed up.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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