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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
Gemini
A
Ollama
S
TaglineUltra-low-latency voice. Built for realtime agents.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Google's answer. Best integrated with Workspace + free for a lot.Run LLMs locally. One-line install, GUI optional.
CategoryVoiceCodingChatbotsDev Platform
PricingFree tier + usage-based APIPart of Claude Pro/Max/Team plansFree + $20/mo Advanced (bundled with 2TB Drive)Free + open source
Best forDevelopers building voice agents, phone bots, interactive apps.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Anyone already on Google, research tasks, summarizing long documents.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
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • 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
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • 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.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for local inference. If you care about privacy or want to tinker, install this today.
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