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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
Rows
A
Cartesia
S
OpenAI Voice / Realtime
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Spreadsheets with AI + live integrations baked in.Ultra-low-latency voice. Built for realtime agents.ChatGPT's voice + the Realtime API for developers.
CategoryCodingDataVoiceVoice
PricingFree (limited) + $10/mo Pro + $19/mo BusinessFree + $19-$89/user/moFree tier + usage-based APIVoice included with ChatGPT Plus; Realtime API by usage
Best forTeams with GitHub already. Devs who don't want to change IDEs.Ops teams, marketers, anyone building dashboards from multiple sources.Developers building voice agents, phone bots, interactive apps.Voice chat users, developers building voice agents on OpenAI.
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Pull live data from Stripe, Slack, Google Analytics, etc.
  • AI functions inside cells
  • Modern UX
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Not a full Excel replacement for heavy users
  • Integrations best on paid tiers
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier. The most interesting spreadsheet in years. Great for ops dashboards.S-tier for realtime. If latency matters more than voice catalog, start here.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.
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