AI coder gets Doom running on a custom CPU designed by GPT-5.6 Sol — game viewport is overlaid on a pulsing schematic of the CPU in Turing Complete's sandbox environment

An AI computing enthusiast has showcased the impressive capability of GPT-5.6 Sol by demonstrating Doom running on a custom CPU it designed. Called Codex-R32, the CPU runs within the Turing Complete game environment, where a pulsating schematic of the CPU provides a live visualization of processor gates, registers, memory, ALUs, and other components. The demonstration used the C-based PureDOOM port, compiled into native RV32IM machine code that runs directly on the custom Codex-R32 CPU.

The AI model's achievement has been hailed as truly insane, as it pushes the boundaries of what is possible with agentic coding. While some may argue that there is always room for more, the AI confidently responded to a challenge to tackle Crysis next. In response, the AI proposed building a GPU, adding gigabytes of RAM, and making the schematic visible from orbit.

It's important to note that although Doom may seem insignificant compared to more demanding games like Crysis, the achievement still showcases the model's potential and performance within the Turing Complete sandbox. The live stats offered during the demonstration, including the cycle counter, sim speed, memory/register values, and more, provide valuable insights into the capabilities of GPT-5.6 Sol's custom CPU.