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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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Gemini
A
Stable Audio
A
OpenRouter
S
TaglineGoogle's answer. Best integrated with Workspace + free for a lot.Stability AI's open audio model. Loops + SFX + background.One API, every model. Pay-as-you-go, no subscriptions.
CategoryChatbotsAudioDev Platform
PricingFree + $20/mo Advanced (bundled with 2TB Drive)Free + $12/mo Pro + enterprisePay per token — model-dependent
Best forAnyone already on Google, research tasks, summarizing long documents.Game developers, podcasters needing SFX, video creators needing background music.Developers experimenting across models. Apps that want fallback logic.
Strengths
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
Weaknesses
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Not for full songs with vocals
  • Shorter generation limits
  • Slight markup over direct API
  • Some provider features not exposed
Kai's verdictA-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.S-tier for model-shopping. I use this for every prototype before committing.
LinkOpen →Open →Open →