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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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Duolingo Max
A
ChatGPT
S
Groq
S
TaglineDuolingo + AI. Explain My Answer + Roleplay features.The default. Strongest ecosystem + best multimodal breadth.The fastest AI inference in the world. Crazy low latency.
Categoryeducationchatdev platform
Pricing$30/mo (or ~$168/yr)Free + $20/mo Plus + $200/mo ProFree tier + pay-as-you-go API
Best forLanguage learners who've outgrown basic Duolingo.General use, voice chat, image generation, first-time AI users.Developers who need sub-100ms LLM responses.
Strengths
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Great voice mode
  • Huge plugin/custom GPT ecosystem
  • Strong image generation (DALL-E built in)
  • Code Interpreter
  • 500+ tokens/sec on Llama/Mixtral — feels instant
  • Custom LPU hardware
  • Great free tier
Weaknesses
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Reasoning quality varies by mode
  • Can be verbose
  • Confabulates on niche facts
  • Open-weight models only (no Claude/GPT)
  • Less flexibility on custom configs
Kai's verdictA-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier all-rounder. If you want one tool that does everything okay-to-great, this is it.S-tier for speed. When latency is the product, start here.
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