KaiAI tutor for anyone

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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
Lex
A
Aider
A
Sora
A
TaglineRun any open-source AI model with an API call.Google Docs with an AI collaborator baked in.Terminal-based AI pair programmer. Git-aware, model-flexible.OpenAI's video model. Long clips, cinematic quality.
CategoryDev PlatformWritingCodingVideo
PricingPay per second of computeFree + $12/moFree (open source) + whatever API you useIncluded with ChatGPT Plus/Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.Developers who want open-source tooling with full control.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
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Works in any terminal
  • Auto-commits changes with meaningful messages
  • Works with any model (Claude, GPT, local)
  • Minimal learning curve
  • 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
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Terminal-only
  • Less agentic than Claude Code
  • Setup on Windows is fiddly
  • 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.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier. The right answer if you want open-source + terminal-native + model-agnostic.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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