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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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Cursor
S
GitHub Copilot
B
Cartesia
S
Perplexity
S
TaglineVS Code fork that made AI coding actually work.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Ultra-low-latency voice. Built for realtime agents.AI search done right. Cited answers, not chat theater.
Categorycodingcodingvoiceresearch
PricingFree + $20/mo Pro + $40/mo BusinessFree (limited) + $10/mo Pro + $19/mo BusinessFree tier + usage-based APIFree + $20/mo Pro
Best forDevelopers. Non-developers who want to ship working code.Teams with GitHub already. Devs who don't want to change IDEs.Developers building voice agents, phone bots, interactive apps.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for coding. If you write code of any kind, this pays back the $20 in a day.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for realtime. If latency matters more than voice catalog, start here.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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