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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
DALL-E 3
B
Lex
A
Devin
A
TaglineRun any open-source AI model with an API call.OpenAI's image model. Built into ChatGPT Plus.Google Docs with an AI collaborator baked in.Cognition Labs' autonomous coding engineer.
CategoryDev PlatformImageWritingAgents
PricingPay per second of computeIncluded with ChatGPT Plus $20/moFree + $12/mo$500/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).ChatGPT Plus users who want images without paying extra.Essays, long-form drafts, thinking on the page.Engineering teams offloading tickets. Ops/platform work.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • 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
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
Kai's verdictS-tier for open-source model APIs. The default in this space.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.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.
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