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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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Dev Platform
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Coding
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Cartesia
S
OpenAI Voice / Realtime
S
GitHub Copilot
B
Devin
A
TaglineUltra-low-latency voice. Built for realtime agents.ChatGPT's voice + the Realtime API for developers.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Cognition Labs' autonomous coding engineer.
CategoryVoiceVoiceCodingAgents
PricingFree tier + usage-based APIVoice included with ChatGPT Plus; Realtime API by usageFree (limited) + $10/mo Pro + $19/mo Business$500/mo
Best forDevelopers building voice agents, phone bots, interactive apps.Voice chat users, developers building voice agents on OpenAI.Teams with GitHub already. Devs who don't want to change IDEs.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • < 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
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-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.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
LinkOpen →Open →Open →Open →