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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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Flux (Black Forest Labs)
A
Sora
A
Replicate
S
TaglineOpen weights + strong photorealism. The open-source answer.OpenAI's video model. Long clips, cinematic quality.Run any open-source AI model with an API call.
CategoryImageVideoDev Platform
PricingAPI + open weights (Schnell is Apache 2.0)Included with ChatGPT Plus/ProPay per second of compute
Best forDevelopers + power users who want control and privacy.ChatGPT subscribers experimenting with cinematic shots.Developers using open-source models (Flux, SDXL, Whisper, etc).
Strengths
  • Runs locally on a beefy GPU
  • Very photoreal
  • Best open-weight model
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
Weaknesses
  • Harder to use than hosted tools
  • Needs infra
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Cold starts on less-popular models
  • Pricing gets real at scale
Kai's verdictA-tier. S-tier if you self-host. The reason open-source image gen matters.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.S-tier for open-source model APIs. The default in this space.
LinkOpen →Open →Open →