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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
Lex
A
Claude Agent SDK
S
Perplexity
S
DALL-E 3
B
TaglineGoogle Docs with an AI collaborator baked in.Anthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.OpenAI's image model. Built into ChatGPT Plus.
CategoryWritingAgentsResearchImage
PricingFree + $12/moAPI usage + SDK is freeFree + $20/mo ProIncluded with ChatGPT Plus $20/mo
Best forEssays, long-form drafts, thinking on the page.Developers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.ChatGPT Plus users who want images without paying extra.
Strengths
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
Weaknesses
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
Kai's verdictA-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.
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