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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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Image
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Meetings
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Replicate
S
Qwen
A
Lex
A
TaglineRun any open-source AI model with an API call.Alibaba's open chat model. Multilingual + agentic.Google Docs with an AI collaborator baked in.
CategoryDev PlatformChatbotsWriting
PricingPay per second of computeFree web + APIFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Vietnamese/Chinese content, SEA multilingual use, developers wanting open-weight tool-use.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
  • Excellent Chinese + Vietnamese + SEA languages
  • Strong at tool-use + agentic workflows
  • Open weights (Qwen2.5, Qwen3)
  • 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
  • English quality behind Claude/GPT
  • Less well-known outside Asia
  • 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.A-tier. The best open model for Vietnamese + Chinese. Don't sleep on it if you work in SEA.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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