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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
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Devin
A
Lex
A
Hex
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TaglineThe fastest AI inference in the world. Crazy low latency.Cognition Labs' autonomous coding engineer.Google Docs with an AI collaborator baked in.Modern data notebook with Magic AI assistant.
CategoryDev PlatformAgentsWritingData
PricingFree tier + pay-as-you-go API$500/moFree + $12/moFree + $28+/user/mo
Best forDevelopers who need sub-100ms LLM responses.Engineering teams offloading tickets. Ops/platform work.Essays, long-form drafts, thinking on the page.Data teams at startups + enterprises.
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
  • SQL + Python + no-code in one notebook
  • Magic AI writes queries + viz for you
  • Team-grade collaboration
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
  • Overkill for casual users
  • Enterprise pricing
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.A-tier for data teams. S-tier if you already live in SQL + Python.
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