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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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Runway
S
Perplexity
S
Suno
S
OpenRouter
S
TaglineThe pro's AI video tool. Gen-4 is the current bar.AI search done right. Cited answers, not chat theater.Prompt to full song with vocals, instruments, the works.One API, every model. Pay-as-you-go, no subscriptions.
CategoryVideoResearchAudioDev Platform
PricingFree + $15-$95/moFree + $20/mo ProFree + $10/mo + $30/moPay per token — model-dependent
Best forMarketing video, pitch decks, b-roll, creative shorts.Replacing Google for any question where you want a cited answer in seconds.Jingles, intros, demos, sketches, personal use.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Expensive at scale
  • Still needs post-editing
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Copyright gray zone
  • Audio quality behind studio
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictS-tier. Market leader with reason. Start here for serious video.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier in its category. The first AI music tool I'd actually listen to.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →Open →