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Claude Agent SDK
S
Claude Code
S
Cartesia
S
TaglineAnthropic's SDK for building your own agents on Claude.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Ultra-low-latency voice. Built for realtime agents.
CategoryAgentsCodingVoice
PricingAPI usage + SDK is freePart of Claude Pro/Max/Team plansFree tier + usage-based API
Best forDevelopers building custom agents for their own company/product.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Developers building voice agents, phone bots, interactive apps.
Strengths
  • 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
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Developer-only
  • You build the UI
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictS-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.S-tier for realtime. If latency matters more than voice catalog, start here.
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