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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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Chatbots
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Replicate
S
Groq
S
ChatGPT Operator
B
Lex
A
TaglineRun any open-source AI model with an API call.The fastest AI inference in the world. Crazy low latency.OpenAI's browser agent. Clicks and types on websites for you.Google Docs with an AI collaborator baked in.
CategoryDev PlatformDev PlatformAgentsWriting
PricingPay per second of computeFree tier + pay-as-you-go APIIncluded with ChatGPT Pro $200/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers who need sub-100ms LLM responses.Power users willing to pay $200/mo for a browser bot.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 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
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • 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
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for speed. When latency is the product, start here.B-tier. Still early. Manus is more flexible for less money.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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