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Claude Agent SDK
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TaglineAnthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.Autonomous AI agent that actually finishes tasks.The one that actually gets text in images right.
CategoryAgentsResearchAgentsImage
PricingAPI usage + SDK is freeFree + $20/mo ProFree tier + $39-$199/moFree + $8/mo + $20/mo + $60/mo
Best forDevelopers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Anything with text — posters, ads, album covers, slide decks.
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
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Best text rendering in the game
  • Strong free tier
  • Good for logos, posters, thumbnails
Weaknesses
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Aesthetic ceiling below Midjourney
  • Less style variety
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.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for text-in-image. Use this for posters, Midjourney for art.
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