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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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Fathom
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Suno
S
Perplexity
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TaglineRun any open-source AI model with an API call.Meeting notes, free forever for individuals.Prompt to full song with vocals, instruments, the works.AI search done right. Cited answers, not chat theater.
Categorydev platformmeetingaudioresearch
PricingPay per second of computeFree for individuals + $15-$29/user/mo teamsFree + $10/mo + $30/moFree + $20/mo Pro
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Solo operators, freelancers, small teams on a budget.Jingles, intros, demos, sketches, personal use.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Unlimited free tier for solo use
  • Strong summaries + action items
  • Works in Zoom, Meet, Teams
  • 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
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Bot-joining model
  • Team features gated
  • Copyright gray zone
  • Audio quality behind studio
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier for solo + free. The best free option, hands down.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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