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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
Claude Code
S
OpenRouter
S
Ollama
S
TaglineUltra-low-latency voice. Built for realtime agents.Anthropic's CLI agent. Opus-powered, operates on your repo directly.One API, every model. Pay-as-you-go, no subscriptions.Run LLMs locally. One-line install, GUI optional.
CategoryVoiceCodingDev PlatformDev Platform
PricingFree tier + usage-based APIPart of Claude Pro/Max/Team plansPay per token — model-dependentFree + open source
Best forDevelopers building voice agents, phone bots, interactive apps.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Developers experimenting across models. Apps that want fallback logic.Devs wanting offline/local LLMs for privacy or experimentation.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Slight markup over direct API
  • Some provider features not exposed
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for model-shopping. I use this for every prototype before committing.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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