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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
OpenAI Voice / Realtime
S
GitHub Copilot
B
Replicate
S
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.Run any open-source AI model with an API call.
CategoryVoiceVoiceCodingDev Platform
PricingFree tier + usage-based APIVoice included with ChatGPT Plus; Realtime API by usageFree (limited) + $10/mo Pro + $19/mo BusinessPay per second of compute
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.Developers using open-source models (Flux, SDXL, Whisper, etc).
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
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
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
  • Cold starts on less-popular models
  • Pricing gets real at scale
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.S-tier for open-source model APIs. The default in this space.
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