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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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GitHub Copilot
B
DeepSeek
S
Cartesia
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.Ultra-low-latency voice. Built for realtime agents.
Categorycodingchatvoice
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree web + ultra-cheap API (~$0.14/M input tokens)Free tier + usage-based API
Best forTeams with GitHub already. Devs who don't want to change IDEs.Developers + cost-conscious builders. Anyone fine with self-hosting.Developers building voice agents, phone bots, interactive apps.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for realtime. If latency matters more than voice catalog, start here.
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