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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Groq
S
Devin
A
Lex
A
Cursor
S
TaglineThe fastest AI inference in the world. Crazy low latency.Cognition Labs' autonomous coding engineer.Google Docs with an AI collaborator baked in.VS Code fork that made AI coding actually work.
CategoryDev PlatformAgentsWritingCoding
PricingFree tier + pay-as-you-go API$500/moFree + $12/moFree + $20/mo Pro + $40/mo Business
Best forDevelopers who need sub-100ms LLM responses.Engineering teams offloading tickets. Ops/platform work.Essays, long-form drafts, thinking on the page.Developers. Non-developers who want to ship working code.
Strengths
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • 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
Weaknesses
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Can feel overwhelming for non-coders
  • Expensive at scale
Kai's verdictS-tier for speed. When latency is the product, start here.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.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.
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