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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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Stable Audio
A
OpenRouter
S
Sora
A
GitHub Copilot
B
TaglineStability AI's open audio model. Loops + SFX + background.One API, every model. Pay-as-you-go, no subscriptions.OpenAI's video model. Long clips, cinematic quality.Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.
CategoryAudioDev PlatformVideoCoding
PricingFree + $12/mo Pro + enterprisePay per token — model-dependentIncluded with ChatGPT Plus/ProFree (limited) + $10/mo Pro + $19/mo Business
Best forGame developers, podcasters needing SFX, video creators needing background music.Developers experimenting across models. Apps that want fallback logic.ChatGPT subscribers experimenting with cinematic shots.Teams with GitHub already. Devs who don't want to change IDEs.
Strengths
  • 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
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Great enterprise story
  • Works in your existing IDE
  • Chat + autocomplete
Weaknesses
  • Not for full songs with vocals
  • Shorter generation limits
  • Slight markup over direct API
  • Some provider features not exposed
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Less agentic than Cursor/Claude Code
  • Model quality varies
Kai's verdictA-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.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.
LinkOpen →Open →Open →Open →