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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
Perplexity
S
Claude Agent SDK
S
Lex
A
Sora
A
TaglineAI search done right. Cited answers, not chat theater.Anthropic'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.
CategoryResearchAgentsWritingVideo
PricingFree + $20/mo ProAPI usage + SDK is freeFree + $12/moIncluded with ChatGPT Plus/Pro
Best forReplacing Google for any question where you want a cited answer in seconds.Developers building custom agents for their own company/product.Essays, long-form drafts, thinking on the page.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • 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
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • 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
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-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.
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