AnalysisDevelopersAugust 7, 2026

Codex + GPT-5.6 Sol Ultra built Raccoon Heist game Moonlight & Mayhem

Simon Willison gave Codex Desktop on GPT-5.6 Sol Ultra the same premise as his Claude Fable 5 'Raccoon Heist' build; it produced 'Moonlight & Mayhem,' a museum-heist game with gpt-image-2 textures. The one-shot version had giant black-sphere eyeballs Codex missed — two prompts fixed it. Session ran 52 minutes.

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