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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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Replicate
S
Kling
A
Lex
A
Pika
A
TaglineRun any open-source AI model with an API call.Kuaishou's video model. The surprise standout.Google Docs with an AI collaborator baked in.The playful, accessible AI video tool.
CategoryDev PlatformVideoWritingVideo
PricingPay per second of computeCredit-based, free trialFree + $12/moFree + $8-$58/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Anyone who wants top-tier video quality for less.Essays, long-form drafts, thinking on the page.Social media creators, beginners, anyone wanting quick fun clips.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Very strong motion + physics
  • Often beats Runway on realism
  • Great price
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
  • Ingredients feature — combine people, objects, scenes
  • Lip sync + sound effects
  • Fun, approachable UX
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • UX is rough for English speakers
  • Queue times
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
  • Lower fidelity than Runway/Kling
  • Still rough on complex scenes
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.A-tier for social/casual. B-tier for serious work. Good entry point.
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