A clay developer watching a monitor where a rocket lifts off from a sprawling automated factory built on a game map, no enemies anywhere

A small robot player in the game seeing only a little lit circle of the map around it, the rest hidden in dark fog, its arms reaching only a short way

The robot player carrying crates by hand between two parts of the factory, a few conveyor lines left unconnected nearby

Illustration, AI-generated from the story text. Tap a panel to read the story through it.

Afternoon Brief · October 31st 2026

GPT-5.6 Sol launched a rocket in Factorio, playing under a human's limits

A developer, Ryan Madden, reported Saturday that GPT-5.6 Sol, running in Codex at a low thinking setting, finished a peaceful game of Factorio (no enemies) and launched a rocket after 13.5 hours of game time. A Python harness held the model to the limits a human player faces through the interface, including reach and fog of war. The model never connected some late-game production lines and carried supplies between factory areas by hand instead. GPT-5.5 never used conveyor belts in the same setup. One run, one person's harness, and no enemies. SourcesA

Sources

AGPT-5.6 beats Factorio (Ryan Madden)ryanmadden.net

This story ran in the Afternoon Brief of October 31st 2026.

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