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S
OpenAI Voice / Realtime
S
Groq
S
ChatGPT Operator
B
TaglineRun any open-source AI model with an API call.ChatGPT's voice + the Realtime API for developers.The fastest AI inference in the world. Crazy low latency.OpenAI's browser agent. Clicks and types on websites for you.
CategoryDev PlatformVoiceDev PlatformAgents
PricingPay per second of computeVoice included with ChatGPT Plus; Realtime API by usageFree tier + pay-as-you-go APIIncluded with ChatGPT Pro $200/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Voice chat users, developers building voice agents on OpenAI.Developers who need sub-100ms LLM responses.Power users willing to pay $200/mo for a browser bot.
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
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
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 speed. When latency is the product, start here.B-tier. Still early. Manus is more flexible for less money.
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