KaiAI tutor for anyone

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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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Gemini
A
DeepSeek
S
Reflect
A
Sora
A
TaglineGoogle's answer. Best integrated with Workspace + free for a lot.Chinese open-weight powerhouse. Crazy cheap, genuinely smart.AI-powered networked notes. Roam with a brain.OpenAI's video model. Long clips, cinematic quality.
CategoryChatbotsChatbotsProductivityVideo
PricingFree + $20/mo Advanced (bundled with 2TB Drive)Free web + ultra-cheap API (~$0.14/M input tokens)$10/moIncluded with ChatGPT Plus/Pro
Best forAnyone already on Google, research tasks, summarizing long documents.Developers + cost-conscious builders. Anyone fine with self-hosting.Knowledge workers + thinkers who want AI in their second brain.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Open weights you can self-host
  • Strong reasoning + math
  • Near-free API pricing
  • DeepSeek-V3 / R1 are serious models
  • AI auto-links related notes
  • Generates backlinks + summaries
  • Clean, minimal UX
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Data goes to servers in China — privacy concerns for business use
  • Chinese policy filters
  • English polish trails Western models
  • Expensive for just notes
  • Smaller community than Obsidian
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictA-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.S-tier for price/performance. A-tier for consumer use. If you build apps, this is the budget pick.A-tier. Niche but beloved. If you've outgrown Notion, try this.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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