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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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OpenRouter
S
Suno
S
Stable Audio
A
Replicate
S
TaglineOne API, every model. Pay-as-you-go, no subscriptions.Prompt to full song with vocals, instruments, the works.Stability AI's open audio model. Loops + SFX + background.Run any open-source AI model with an API call.
CategoryDev PlatformAudioAudioDev Platform
PricingPay per token — model-dependentFree + $10/mo + $30/moFree + $12/mo Pro + enterprisePay per second of compute
Best forDevelopers experimenting across models. Apps that want fallback logic.Jingles, intros, demos, sketches, personal use.Game developers, podcasters needing SFX, video creators needing background music.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Copyright gray zone
  • Audio quality behind studio
  • Not for full songs with vocals
  • Shorter generation limits
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.S-tier in its category. The first AI music tool I'd actually listen to.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.S-tier for open-source model APIs. The default in this space.
LinkOpen →Open →Open →Open →