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Claude Agent SDK
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Cursor
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Groq
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Perplexity
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TaglineAnthropic's SDK for building your own agents on Claude.VS Code fork that made AI coding actually work.The fastest AI inference in the world. Crazy low latency.AI search done right. Cited answers, not chat theater.
CategoryAgentsCodingDev PlatformResearch
PricingAPI usage + SDK is freeFree + $20/mo Pro + $40/mo BusinessFree tier + pay-as-you-go APIFree + $20/mo Pro
Best forDevelopers building custom agents for their own company/product.Developers. Non-developers who want to ship working code.Developers who need sub-100ms LLM responses.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Developer-only
  • You build the UI
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for speed. When latency is the product, start here.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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