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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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Suno
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TaglineRun any open-source AI model with an API call.Autonomous AI agent that actually finishes tasks.Cognition Labs' autonomous coding engineer.Prompt to full song with vocals, instruments, the works.
CategoryDev PlatformAgentsAgentsAudio
PricingPay per second of computeFree tier + $39-$199/mo$500/moFree + $10/mo + $30/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Engineering teams offloading tickets. Ops/platform work.Jingles, intros, demos, sketches, personal use.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Copyright gray zone
  • Audio quality behind studio
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier in the agent category. The first one I'd give to a non-technical friend.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier in its category. The first AI music tool I'd actually listen to.
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