Simon Willison • 8/7/2026

Moonlight & Mayhem (Raccoon Heist by Codex + GPT-5.6 Sol Ultra)

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This article details an experiment where the author used Codex Desktop running GPT-5.6 Sol Ultra to generate a complete game from a prompt originally given to Claude Fable 5. The game, 'Moonlight & Mayhem', involves thieving raccoons in a museum heist. The author notes the AI produced a better game than the previous attempt, but encountered a visual bug with oversized eyeballs, which was fixed via additional prompts. The article includes a GitHub repository with code and textures, and discusses the cost and time of the AI session.

Moonlight & Mayhem (Raccoon Heist by Codex + GPT-5.6 Sol Ultra)

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