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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
Suno
S
Cursor
S
Lex
A
TaglineRun any open-source AI model with an API call.Prompt to full song with vocals, instruments, the works.VS Code fork that made AI coding actually work.Google Docs with an AI collaborator baked in.
Categorydev platformaudiocodingwriting
PricingPay per second of computeFree + $10/mo + $30/moFree + $20/mo Pro + $40/mo BusinessFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Jingles, intros, demos, sketches, personal use.Developers. Non-developers who want to ship working code.Essays, long-form drafts, thinking on the page.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • Tab completion feels like mind-reading
  • Composer for multi-file edits
  • Runs Claude, GPT, Gemini — you pick
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Copyright gray zone
  • Audio quality behind studio
  • Can feel overwhelming for non-coders
  • Expensive at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for open-source model APIs. The default in this space.S-tier in its category. The first AI music tool I'd actually listen to.S-tier for coding. If you write code of any kind, this pays back the $20 in a day.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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