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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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Devin
A
Lex
A
Suno
S
Groq
S
TaglineCognition Labs' autonomous coding engineer.Google Docs with an AI collaborator baked in.Prompt to full song with vocals, instruments, the works.The fastest AI inference in the world. Crazy low latency.
CategoryAgentsWritingAudioDev Platform
Pricing$500/moFree + $12/moFree + $10/mo + $30/moFree tier + pay-as-you-go API
Best forEngineering teams offloading tickets. Ops/platform work.Essays, long-form drafts, thinking on the page.Jingles, intros, demos, sketches, personal use.Developers who need sub-100ms LLM responses.
Strengths
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
Weaknesses
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Copyright gray zone
  • Audio quality behind studio
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
Kai's verdictA-tier for the right use case. Not for solo devs. If you manage engineers, try one license.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.S-tier in its category. The first AI music tool I'd actually listen to.S-tier for speed. When latency is the product, start here.
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