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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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S
Flux (Black Forest Labs)
A
Stable Audio
A
TaglineRun any open-source AI model with an API call.Open weights + strong photorealism. The open-source answer.Stability AI's open audio model. Loops + SFX + background.
CategoryDev PlatformImageAudio
PricingPay per second of computeAPI + open weights (Schnell is Apache 2.0)Free + $12/mo Pro + enterprise
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Developers + power users who want control and privacy.Game developers, podcasters needing SFX, video creators needing background music.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Harder to use than hosted tools
  • Needs infra
  • Not for full songs with vocals
  • Shorter generation limits
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. S-tier if you self-host. The reason open-source image gen matters.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.
LinkOpen →Open →Open →