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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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Replicate
S
OpenAI Voice / Realtime
S
Claude Agent SDK
S
Perplexity
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.AI search done right. Cited answers, not chat theater.
CategoryDev PlatformVoiceAgentsResearch
PricingPay per second of computeVoice included with ChatGPT Plus; Realtime API by usageAPI usage + SDK is freeFree + $20/mo Pro
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.Replacing Google for any question where you want a cited answer in seconds.
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
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
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
  • Not a general chatbot
  • Answers can be shallow on complex topics
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.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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