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Claude Agent SDK
S
Perplexity
S
Lex
A
Sora
A
TaglineAnthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.OpenAI's video model. Long clips, cinematic quality.
CategoryAgentsResearchWritingVideo
PricingAPI usage + SDK is freeFree + $20/mo ProFree + $12/moIncluded with ChatGPT Plus/Pro
Best forDevelopers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • 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
  • 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
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • 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 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.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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