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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
Claude
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Anthropic's flagship — best reasoning + longest useful context.
CategoryChatbotsChatbots
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $20/mo Pro + team/enterprise
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Long writing, code, careful thinking, documents over 50 pages.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Image generation is weak
  • No native web search on all tiers
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier for reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.
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