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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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Dev Platform
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Research
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Productivity
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Education
Duolingo Max
A
Claude Code
S
OpenAI Voice / Realtime
S
Perplexity
S
TaglineDuolingo + AI. Explain My Answer + Roleplay features.Anthropic's CLI agent. Opus-powered, operates on your repo directly.ChatGPT's voice + the Realtime API for developers.AI search done right. Cited answers, not chat theater.
CategoryEducationCodingVoiceResearch
Pricing$30/mo (or ~$168/yr)Part of Claude Pro/Max/Team plansVoice included with ChatGPT Plus; Realtime API by usageFree + $20/mo Pro
Best forLanguage learners who've outgrown basic Duolingo.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Voice chat users, developers building voice agents on OpenAI.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Explain My Answer = personal tutor for every mistake
  • Roleplay = real conversation practice
  • Gamification that actually sticks
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Advanced Voice Mode feels genuinely conversational
  • Realtime API enables true two-way voice apps
  • Built into ChatGPT
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Pricey vs free Duolingo
  • Conversation AI still stiff sometimes
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Pricey for production apps
  • Less voice variety than ElevenLabs
  • Platform lock-in
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictA-tier. If you already love Duolingo, worth it. If starting fresh, try ChatGPT Voice instead.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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