One-Shotting a Flappy Bird iPhone App with Devin and GPT-6 Astra

Melvin Vivas · X video post · 2026-09-18 · 0:17 · 1,216 views · Open on X

Topics: AI Dev Tools & Productivity · Level: beginner

Summary

This is a short demo post. Melvin Vivas says he built a Flappy Bird clone as an iPhone app in one shot, using the AI coding agent Devin with the GPT-6 Astra model. The 17-second video has no narration, and the post gives no prompt, setup or workflow details. It is mainly a showcase of what agentic coding tools can produce from a single request.

Key points

• The creator says a whole Flappy Bird iPhone app was built in one shot, meaning from a single request with no back-and-forth.
• The tools named are Devin (Cognition's autonomous AI software engineer) and the model GPT-6 Astra.
• The post doesn't share the prompt, the tech stack (e.g. Swift/SwiftUI) or how the result was checked, so you can't reproduce it directly from the post.
• Running or publishing a native iPhone app on real devices or the App Store needs an Apple Developer account. The creator says he's renewing his.
• Small, well-known games like Flappy Bird are a common quick benchmark for what AI coding agents can do.

Resources mentioned

• Devin · tool · x.com · paid
  A desktop app from the makers of the Devin coding agent for planning, delegating, reviewing and shipping work across fleets of local and cloud coding agents.
  Also in: Using the Devin iOS App to Build iOS Apps (Quick Demo) (Melvin Vivas on X · notes), Use Your ChatGPT Plus/Pro Subscription to Run Devin (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes), Devin price cuts and top score on FrontierCode 1.1 Extended (Melvin Vivas on X · notes) and 44 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
• Apple Developer Program · website · developer.apple.com · paid
  Apple's paid developer membership, needed to put iOS apps on devices broadly and publish them to the App Store.
  Also in: Devin Gets a Mac: Building iOS and macOS Apps in the Cloud from a Prompt (Melvin Vivas on X · notes)

Try this

• Try to build a Flappy Bird clone as an iPhone app from a single prompt to an AI coding agent such as Devin.