Quiz App AI with Codex

An adaptive AI learning platform using Codex, GPT-5.6, MCP, and RAG. It generates personalized daily quizzes based on each learner's progress instead of fixed lessons.

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🚀 Inspiration

Living in Switzerland as a foreigner, my wife is currently preparing for the Swiss permanent residency examination. She wanted an AI tutor that could help her study every day instead of relying on static learning materials.

This inspired me to build an adaptive AI learning experience. While developing AiTalk.ch, our AI Voice Agent platform, I started building a Quiz App that delivers personalized learning every day.

Originally developed as a feature of AiTalk.ch, this project was redesigned and separated into an independent application for OpenAI Build Week.

📚 What it does

Quiz App AI with Codex is an adaptive AI learning platform.

Users upload their own knowledge into a RAG knowledge base—for example, Swiss permanent residency materials, language learning content, company training documents, or certification guides.

Every day, at a scheduled time, the mobile app sends a push notification inviting the learner to study. When opened, GPT-5.6 generates personalized learning content and quiz questions based on the stored knowledge and the learner's previous performance.

Quiz results are stored, allowing the next day's lesson and questions to adapt automatically to the learner's strengths and knowledge gaps.

Instead of delivering the same fixed lessons to everyone, the platform continuously creates personalized learning experiences.

⚙️ How we built it

The mobile application contains the quiz engine and learning interface, while all learning content is generated dynamically using GPT-5.6 and RAG.

For OpenAI Build Week, the biggest architectural change was replacing the traditional SaaS administration dashboard with Codex.

The project combines:

  • Codex
  • GPT-5.6
  • MCP
  • RAG
  • OpenAI API
  • Mobile App

Using Codex through MCP, administrators can:

  • Generate new quiz datasets
  • Upload learning knowledge directly into RAG
  • Modify AI system instructions
  • Configure quiz behavior and learning workflows

No traditional SaaS administration panel is required. Everything is managed directly from Codex.

🚧 Challenges we ran into

Because the final learning experience runs as a native mobile application, distributing test builds became one of the biggest challenges.

Publishing through Google Play and Apple App Store requires additional review processes, making rapid testing difficult during the hackathon.

The current version supports Android through Google Play testing, where invited testers can install the application using their registered Google accounts.

✅ Accomplishments that we're proud of

We successfully integrated an adaptive Quiz App into AiTalk.ch and completed a fully working mobile application.

More importantly, we demonstrated that the complete administration workflow—including quiz generation, RAG management, and AI configuration—can be operated entirely through Codex and MCP without building a traditional SaaS management interface.

📖 What we learned

Before this project, I viewed Codex primarily as a coding assistant.

During OpenAI Build Week, I realized that Codex combined with MCP can become the operational interface of an entire SaaS platform—not just a programming tool.

Instead of building complex administration dashboards, AI can now become the dashboard itself.

🔮 What's next

After Build Week, Quiz App AI with Codex will be integrated back into AiTalk.ch as one of its core AI applications.

The next major milestone is integrating GPT Realtime Audio so learners can practice speaking and listening through natural AI conversations.

Beyond quizzes, I plan to build additional AI-powered educational applications on the same adaptive learning platform.

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