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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
Devin
A
DALL-E 3
B
Lex
A
TaglineRun any open-source AI model with an API call.Cognition Labs' autonomous coding engineer.OpenAI's image model. Built into ChatGPT Plus.Google Docs with an AI collaborator baked in.
CategoryDev PlatformAgentsImageWriting
PricingPay per second of compute$500/moIncluded with ChatGPT Plus $20/moFree + $12/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Engineering teams offloading tickets. Ops/platform work.ChatGPT Plus users who want images without paying extra.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
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
  • 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
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • 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.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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