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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
Runway
S
ChatGPT Operator
B
Stable Audio
A
TaglineChinese open-weight powerhouse. Crazy cheap, genuinely smart.The pro's AI video tool. Gen-4 is the current bar.OpenAI's browser agent. Clicks and types on websites for you.Stability AI's open audio model. Loops + SFX + background.
CategoryChatbotsVideoAgentsAudio
PricingFree web + ultra-cheap API (~$0.14/M input tokens)Free + $15-$95/moIncluded with ChatGPT Pro $200/moFree + $12/mo Pro + enterprise
Best forDevelopers + cost-conscious builders. Anyone fine with self-hosting.Marketing video, pitch decks, b-roll, creative shorts.Power users willing to pay $200/mo for a browser bot.Game developers, podcasters needing SFX, video creators needing background music.
Strengths
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Actually uses websites — fills forms, clicks, checks out
  • Built into ChatGPT
  • Good for repetitive web tasks
  • Open-weight model available
  • Great for loops + game audio + SFX
  • Commercial-use clarity
Weaknesses
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Expensive at scale
  • Still needs post-editing
  • Slow vs doing it yourself
  • Breaks on complex auth flows
  • $200/mo gate
  • Not for full songs with vocals
  • Shorter generation limits
Kai's verdictS-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.S-tier. Market leader with reason. Start here for serious video.B-tier. Still early. Manus is more flexible for less money.A-tier for its niche. Different use case than Suno — SFX and loops, not songs.
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