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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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S
Cartesia
S
Claude Code
S
TaglineAI search done right. Cited answers, not chat theater.Ultra-low-latency voice. Built for realtime agents.Anthropic's CLI agent. Opus-powered, operates on your repo directly.
CategoryResearchVoiceCoding
PricingFree + $20/mo ProFree tier + usage-based APIPart of Claude Pro/Max/Team plans
Best forReplacing Google for any question where you want a cited answer in seconds.Developers building voice agents, phone bots, interactive apps.Developers who want an agent, not autocomplete. Large refactors, tests, docs.
Strengths
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • < 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
Weaknesses
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
Kai's verdictS-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-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.
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