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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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Image
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S
GitHub Copilot
B
Cartesia
S
OpenAI Voice / Realtime
S
TaglineRun any open-source AI model with an API call.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.Ultra-low-latency voice. Built for realtime agents.ChatGPT's voice + the Realtime API for developers.
CategoryDev PlatformCodingVoiceVoice
PricingPay per second of computeFree (limited) + $10/mo Pro + $19/mo BusinessFree tier + usage-based APIVoice included with ChatGPT Plus; Realtime API by usage
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Teams with GitHub already. Devs who don't want to change IDEs.Developers building voice agents, phone bots, interactive apps.Voice chat users, developers building voice agents on OpenAI.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
  • < 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
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less agentic than Cursor/Claude Code
  • Model quality varies
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
Kai's verdictS-tier for open-source model APIs. The default in this space.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.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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