Building and Deploying a Flappy Bird Clone with GPT-6 Astra in Codex

Melvin Vivas · X video post · 2026-09-06 · 0:22 · 1,147 views · Open on X

Topics: AI Dev Tools & Productivity, Portfolio Projects · Level: beginner

Summary

Melvin Vivas shows a full Flappy Bird game he built with OpenAI's GPT-6 Astra model inside Codex. He says it fit within his 5-hour usage limit, and Codex also deployed the game to ChatGPT sites as a live web page. It's a short demo of an AI coding agent going from prompt to a hosted game, not a step-by-step tutorial.

Key points

• The model used was GPT-6 Astra, run inside OpenAI's Codex coding agent.
• A complete Flappy Bird game was built within one 5-hour Codex usage window.
• Codex also handled deployment: the game was published to ChatGPT sites (a *.chatgpt.site subdomain).
• The result is playable at flappy-bird-arcade.donvitocodes.chatgpt.site, titled 'Flappy Bird — Pocket Arcade'.
• A small, well-known game like this is a good way to test what a coding agent can build and deploy in one session.
• The post doesn't share prompts, code or workflow steps, so it shows what's possible rather than how to do it.

Resources mentioned

• Flappy Bird — Pocket Arcade · website · flappy-bird-arcade.donvitocodes.chatgpt.site · free
  The creator's live Flappy Bird clone, built by GPT-6 Astra in Codex and hosted on ChatGPT sites.
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more
• GPT-6 Astra · tool · openai.com · paid
  The model announced in the quoted launch post, pitched as the developer's most capable model for work, coding, science and cybersecurity, and able to operate a computer.
  Also in: Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), Pi Agent Council: Ask Multiple LLMs in Parallel and Compare Their Advice (Melvin Vivas on X · notes), Use GPT-6.1 Sol by Default, Save Astra for Emergencies (Melvin Vivas on X · notes), Dots in ChatGPT: always-on AI agents that you hand responsibilities to (Melvin Vivas on X · notes) and 49 more
• ChatGPT sites · tool · help.openai.com · paid
  OpenAI's hosting feature that publishes web apps to *.chatgpt.site subdomains.

Try this

• Play the deployed game to see what Codex produced.
• Build a full Flappy Bird–style arcade game with a coding agent (e.g., Codex) within one usage window, then have the agent deploy it to a public URL.