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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
Suno
S
Perplexity
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.Google Docs with an AI collaborator baked in.Prompt to full song with vocals, instruments, the works.AI search done right. Cited answers, not chat theater.
CategoryChatbotsWritingAudioResearch
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $12/moFree + $10/mo + $30/moFree + $20/mo Pro
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Essays, long-form drafts, thinking on the page.Jingles, intros, demos, sketches, personal use.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
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • 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
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Copyright gray zone
  • Audio quality behind studio
  • 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.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier in its category. The first AI music tool I'd actually listen to.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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