KaiAI tutor for anyone

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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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DeepSeek
S
Lex
A
Cursor
S
Groq
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Google Docs with an AI collaborator baked in.VS Code fork that made AI coding actually work.The fastest AI inference in the world. Crazy low latency.
CategoryChatbotsWritingCodingDev Platform
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $12/moFree + $20/mo Pro + $40/mo BusinessFree tier + pay-as-you-go API
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Essays, long-form drafts, thinking on the page.Developers. Non-developers who want to ship working code.Developers who need sub-100ms LLM responses.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.S-tier for speed. When latency is the product, start here.
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