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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
OpenRouter
S
Claude Code
S
Ollama
S
TaglineUltra-low-latency voice. Built for realtime agents.One API, every model. Pay-as-you-go, no subscriptions.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Run LLMs locally. One-line install, GUI optional.
CategoryVoiceDev PlatformCodingDev Platform
PricingFree tier + usage-based APIPay per token — model-dependentPart of Claude Pro/Max/Team plansFree + open source
Best forDevelopers building voice agents, phone bots, interactive apps.Developers experimenting across models. Apps that want fallback logic.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Devs wanting offline/local LLMs for privacy or experimentation.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • 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
  • Slight markup over direct API
  • Some provider features not exposed
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • 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 for model-shopping. I use this for every prototype before committing.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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