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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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OpenAI Voice / Realtime
S
Claude Agent SDK
S
TaglineRun any open-source AI model with an API call.ChatGPT's voice + the Realtime API for developers.Anthropic's SDK for building your own agents on Claude.
CategoryDev PlatformVoiceAgents
PricingPay per second of computeVoice included with ChatGPT Plus; Realtime API by usageAPI usage + SDK is free
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Voice chat users, developers building voice agents on OpenAI.Developers building custom agents for their own company/product.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Developer-only
  • You build the UI
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.S-tier for builders. The right primitives. What Kai is built on under the hood.
LinkOpen →Open →Open →