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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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Chatbots
Research
Coding
Image
Video
Voice
Meetings
Design
Productivity
Audio
Writing
Agents
Dev Platform
Data
Marketing
Education
Replicate
S
Sora
A
Lex
A
DALL-E 3
B
TaglineRun any open-source AI model with an API call.OpenAI's video model. Long clips, cinematic quality.Google Docs with an AI collaborator baked in.OpenAI's image model. Built into ChatGPT Plus.
CategoryDev PlatformVideoWritingImage
PricingPay per second of computeIncluded with ChatGPT Plus/ProFree + $12/moIncluded with ChatGPT Plus $20/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).ChatGPT subscribers experimenting with cinematic shots.Essays, long-form drafts, thinking on the page.ChatGPT Plus users who want images without paying extra.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Excellent prompt understanding
  • Built into ChatGPT — no extra subscription
  • Good at composition + concepts
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Aesthetic ceiling below Midjourney + Ideogram
  • Text rendering worse than Ideogram
  • No fine control
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.B-tier standalone, A-tier value if you already pay ChatGPT. Don't pay for it separately.
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