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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
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Claude Code
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TaglineAutonomous AI agent that actually finishes tasks.Anthropic's SDK for building your own agents on Claude.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
CategoryAgentsAgentsCoding
PricingFree tier + $39-$199/moAPI usage + SDK is freePart of Claude Pro/Max/Team plans
Best forPeople who want to hand off tasks entirely — trip planning, research, spreadsheet building.Developers building custom agents for their own company/product.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
Weaknesses
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Developer-only
  • You build the UI
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictS-tier in the agent category. The first one I'd give to a non-technical friend.S-tier for builders. The right primitives. What Kai is built on under the hood.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
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