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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
Groq
S
Lex
A
Perplexity
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.The fastest AI inference in the world. Crazy low latency.Google Docs with an AI collaborator baked in.AI search done right. Cited answers, not chat theater.
CategoryChatbotsDev PlatformWritingResearch
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free tier + pay-as-you-go APIFree + $12/moFree + $20/mo Pro
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Developers who need sub-100ms LLM responses.Essays, long-form drafts, thinking on the page.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for speed. When latency is the product, start here.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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