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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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OpenRouter
S
ChatGPT Operator
B
Replicate
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.OpenAI's browser agent. Clicks and types on websites for you.Run any open-source AI model with an API call.
Categorydev platformagentsdev platform
PricingPay per token — model-dependentIncluded with ChatGPT Pro $200/moPay per second of compute
Best forDevelopers experimenting across models. Apps that want fallback logic.Power users willing to pay $200/mo for a browser bot.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.B-tier. Still early. Manus is more flexible for less money.S-tier for open-source model APIs. The default in this space.
LinkOpen →Open →Open →