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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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Claude Agent SDK
S
Perplexity
S
Cursor
S
Devin
A
TaglineAnthropic's SDK for building your own agents on Claude.AI search done right. Cited answers, not chat theater.VS Code fork that made AI coding actually work.Cognition Labs' autonomous coding engineer.
CategoryAgentsResearchCodingAgents
PricingAPI usage + SDK is freeFree + $20/mo ProFree + $20/mo Pro + $40/mo Business$500/mo
Best forDevelopers building custom agents for their own company/product.Replacing Google for any question where you want a cited answer in seconds.Developers. Non-developers who want to ship working code.Engineering teams offloading tickets. Ops/platform work.
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
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Developer-only
  • You build the UI
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
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 for coding. If you write code of any kind, this pays back the $20 in a day.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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