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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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Claude Code
S
Cartesia
S
Gemini
A
TaglineAnthropic's CLI agent. Opus-powered, operates on your repo directly.Ultra-low-latency voice. Built for realtime agents.Google's answer. Best integrated with Workspace + free for a lot.
Categorycodingvoicechat
PricingPart of Claude Pro/Max/Team plansFree tier + usage-based APIFree + $20/mo Advanced (bundled with 2TB Drive)
Best forDevelopers who want an agent, not autocomplete. Large refactors, tests, docs.Developers building voice agents, phone bots, interactive apps.Anyone already on Google, research tasks, summarizing long documents.
Strengths
  • 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
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
Weaknesses
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
Kai's verdictS-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.A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
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