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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
Gemini
A
Claude Code
S
Perplexity
S
TaglineUltra-low-latency voice. Built for realtime agents.Google's answer. Best integrated with Workspace + free for a lot.Anthropic's CLI agent. Opus-powered, operates on your repo directly.AI search done right. Cited answers, not chat theater.
CategoryVoiceChatbotsCodingResearch
PricingFree tier + usage-based APIFree + $20/mo Advanced (bundled with 2TB Drive)Part of Claude Pro/Max/Team plansFree + $20/mo Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Anyone already on Google, research tasks, summarizing long documents.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • < 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
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-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.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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