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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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TaglineRun any open-source AI model with an API call.AI search done right. Cited answers, not chat theater.Google Docs with an AI collaborator baked in.Cognition Labs' autonomous coding engineer.
Categorydev platformresearchwritingagents
PricingPay per second of computeFree + $20/mo ProFree + $12/mo$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Replacing Google for any question where you want a cited answer in seconds.Essays, long-form drafts, thinking on the page.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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