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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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Cartesia
S
Ollama
S
Claude Code
S
TaglineUltra-low-latency voice. Built for realtime agents.Run LLMs locally. One-line install, GUI optional.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
CategoryVoiceDev PlatformCoding
PricingFree tier + usage-based APIFree + open sourcePart of Claude Pro/Max/Team plans
Best forDevelopers building voice agents, phone bots, interactive apps.Devs wanting offline/local LLMs for privacy or experimentation.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.S-tier for local inference. If you care about privacy or want to tinker, install this today.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.
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