A real-world flight simulator built with Opus and Codex
Originally posted on LinkedIn, February 12, 2026.
In 2025, Levelsio posted a flight simulator he had built through vibe coding. Now the CEO of Grw AI has built a simulator that lets you fly over real locations around the world. Israel is not on the list, in case you were wondering.
@alistairmcleay described the process:
I used Opus 4.6 for the architecture / planning and GPT-5.3 in Codex for the actual implementation With Opus passing context to Codex
You can try the flight simulator yourself. I had a blast flying it, literally.