GoKawiilOpenAI's GPT-5.6 Sol completes Factorio peaceful-mode run via Codex
Developer Ryan Madden reports that GPT-5.6 Sol, running in Codex with low thinking level, completed a peaceful (no-biters) Factorio playthrough through rocket launch in 13.5 hours of in-game time. Sol interacted with the game through a Python library that enforced the same GUI-style restrictions human players face, such as player reach and fog of war, and Madden tracked production statistics and science milestones throughout the run.
GoKawiil's interpretation of the reporting above, not reported fact.
The run suggests incremental improvement in AI models' ability to handle long-horizon, multi-step planning tasks compared to Madden's earlier attempt with GPT-5.5, which he says struggled. However, Madden notes the model resorted to manual workarounds to compensate for failures in connecting late-game production systems, indicating current limits in sustained complex reasoning even as surface-level results improve.
- GPT-5.6 Sol completed a peaceful Factorio run to rocket launch in 13.5 in-game hours using Codex.
- The model played via a Python library enforcing human-like GUI restrictions, not direct game-state access.
- Sol showed scaling weaknesses in late-game stages, requiring manual workarounds to finish the run, an improvement over GPT-5.5's prior attempt.
Factorio PC Game (Steam) — If reading about AI agents conquering Factorio has you itching to try it yourself, grab the actual game and start building your own automated factories. It's endlessly replayable, with the same core systems of logistics, automation, and optimization that made this AI experiment so compelling to watch.
See Factorio PC Game (Steam) on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: ryanmadden.net — Ryan Madden, 2026-10-31
Published there as: “GPT-5.6 Sol can beat Factorio on peaceful mode”
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