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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
Chatbots
Image
Video
Voice
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Claude Agent SDK
S
DALL-E 3
B
Cursor
S
Lex
A
TaglineAnthropic's SDK for building your own agents on Claude.OpenAI's image model. Built into ChatGPT Plus.VS Code fork that made AI coding actually work.Google Docs with an AI collaborator baked in.
CategoryAgentsImageCodingWriting
PricingAPI usage + SDK is freeIncluded with ChatGPT Plus $20/moFree + $20/mo Pro + $40/mo BusinessFree + $12/mo
Best forDevelopers building custom agents for their own company/product.ChatGPT Plus users who want images without paying extra.Developers. Non-developers who want to ship working code.Essays, long-form drafts, thinking on the page.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Developer-only
  • You build the UI
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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