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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
OpenAI Voice / Realtime
S
Cartesia
S
Replicate
S
TaglineMicrosoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.ChatGPT's voice + the Realtime API for developers.Ultra-low-latency voice. Built for realtime agents.Run any open-source AI model with an API call.
CategoryCodingVoiceVoiceDev Platform
PricingFree (limited) + $10/mo Pro + $19/mo BusinessVoice included with ChatGPT Plus; Realtime API by usageFree tier + usage-based APIPay per second of compute
Best forTeams with GitHub already. Devs who don't want to change IDEs.Voice chat users, developers building voice agents on OpenAI.Developers building voice agents, phone bots, interactive apps.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictB-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.S-tier for realtime. If latency matters more than voice catalog, start here.S-tier for open-source model APIs. The default in this space.
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