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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
Audio
Research
Agents
Coding
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Image
Video
Voice
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Claude Agent SDK
S
Lex
A
Cursor
S
Sora
A
TaglineAnthropic's SDK for building your own agents on Claude.Google Docs with an AI collaborator baked in.VS Code fork that made AI coding actually work.OpenAI's video model. Long clips, cinematic quality.
CategoryAgentsWritingCodingVideo
PricingAPI usage + SDK is freeFree + $12/moFree + $20/mo Pro + $40/mo BusinessIncluded with ChatGPT Plus/Pro
Best forDevelopers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.Developers. Non-developers who want to ship working code.ChatGPT subscribers experimenting with cinematic shots.
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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Developer-only
  • You build the UI
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
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.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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