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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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Claude Agent SDK
S
Lex
A
Sora
A
Cursor
S
TaglineAnthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.OpenAI's video model. Long clips, cinematic quality.VS Code fork that made AI coding actually work.
CategoryAgentsWritingVideoCoding
PricingAPI usage + SDK is freeFree + $12/moIncluded with ChatGPT Plus/ProFree + $20/mo Pro + $40/mo Business
Best forDevelopers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.ChatGPT subscribers experimenting with cinematic shots.Developers. Non-developers who want to ship working code.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • 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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
Weaknesses
  • Developer-only
  • You build the UI
  • 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
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.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 coding. If you write code of any kind, this pays back the $20 in a day.
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