Codex-cli with GPT-5.3 codex xhigh - 5 hours made a fully working GBA emulator in assembly code!
Watch as GPT-5.3 autonomously builds and debugs a complex emulator from scratch...
Deep Dive
A developer claims GPT-5.3 Codex xHigh built a fully functional Nintendo Game Boy Advance emulator in pure assembly code in just 5 hours. The model autonomously created a detailed plan, wrote the code, and debugged the system to run games like Super Mario Advance. The project consumed 50% of the user's 5-hour API limit, suggesting significant computational resources were required for this complex, low-level programming task.
Why It Matters
This demonstrates AI's potential to autonomously tackle complex, low-level systems programming previously thought to require deep human expertise.