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
Claude
S
ChatGPT
S
Duolingo Max
A
TaglineGoogle's answer. Best integrated with Workspace + free for a lot.Anthropic's flagship — best reasoning + longest useful context.The default. Strongest ecosystem + best multimodal breadth.Duolingo + AI. Explain My Answer + Roleplay features.
Categorychatchatchateducation
PricingFree + $20/mo Advanced (bundled with 2TB Drive)Free + $20/mo Pro + team/enterpriseFree + $20/mo Plus + $200/mo Pro$30/mo (or ~$168/yr)
Best forAnyone already on Google, research tasks, summarizing long documents.Long writing, code, careful thinking, documents over 50 pages.General use, voice chat, image generation, first-time AI users.Language learners who've outgrown basic Duolingo.
Strengths
  • Native Google Workspace integration
  • Very long context (1M+)
  • Deep Research feature
  • Free tier is generous
  • Best-in-class writing + nuanced reasoning
  • 1M context on Opus
  • Artifacts for code/docs
  • Lowest hallucination rate in my testing
  • Great voice mode
  • Huge plugin/custom GPT ecosystem
  • Strong image generation (DALL-E built in)
  • Code Interpreter
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
Weaknesses
  • Writing quality trails Claude
  • Over-refusals on edge content
  • UI is cluttered
  • Image generation is weak
  • No native web search on all tiers
  • Reasoning quality varies by mode
  • Can be verbose
  • Confabulates on niche facts
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
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 reasoning and writing. If you only pay for one chatbot, pay for this one — especially for long work.S-tier all-rounder. If you want one tool that does everything okay-to-great, this is it.A-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.
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