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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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DeepSeek
S
Sora
A
Stable Audio
A
NotebookLM
S
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.OpenAI's video model. Long clips, cinematic quality.Stability AI's open audio model. Loops + SFX + background.Google's research notebook. Turns your docs into a podcast.
CategoryChatbotsVideoAudioResearch
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Included with ChatGPT Plus/ProFree + $12/mo Pro + enterpriseFree
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.ChatGPT subscribers experimenting with cinematic shots.Game developers, podcasters needing SFX, video creators needing background music.Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
  • Not for full songs with vocals
  • Shorter generation limits
  • Google-only
  • Can be slow on large corpora
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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