Article · 2026-08-07 · 5 moments

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

Moonlight & Mayhem (Raccoon Heist by Codex + GPT-5.6 Sol Ultra) On Wednesday I wrote about One-shotting a Raccoon Heist game using Claude Fable 5, where I had Claude Fable 5 build a full working game from a premise I generated with GPT-3 and DALL-E four years ago. I decided to pose the exact same prompt to Codex Desktop running GPT-5.6 Sol Ultra - the mode where Sol makes aggressive use of sub-agents - to see how it would do. It produced a much better game! Here's Moonlight & Mayhem - GitHub ✦ AI generated

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GUEST Author HOST Simon Willison

Claim◆

Posing the exact same game-building prompt to Codex Desktop running GPT-5.6 Sol Ultra produced a much better game than Claude Fable 5 did.

The author ran the exact same Raccoon Heist prompt on Codex Desktop with GPT-5.6 Sol Ultra (which aggressively uses sub-agents) and got a much better game than with Claude Fable 5.

transcript

Author: I decided to pose the exact same prompt to Codex Desktop running GPT-5.6 Sol Ultra - the mode where Sol makes aggressive use of sub-agents - to see how it would do. It produced a much better game! Here's Moonlight & Mayhem - GitHub repository here, including the textures and prompts it generated using gpt-image-2.

Context

The author wishes Claude Code had a 'copy as Markdown' feature like the one Codex offers, and shared the full Codex transcript in the repository.

Noting the Codex transcript was shared in the repo, the author expressed wanting Claude Code to have the same 'copy as Markdown' feature that Codex provides.

transcript

Author: I shared the full Codex transcript in the repository - I wish Claude Code had the same "copy as Markdown" feature.

Mechanism◆

The gameplay design of the GPT-5.6 Sol version is dramatically more aligned with the original heist concept than Fable's was.

Where Fable's version reduced the heist to a single raccoon collecting coins in a yard, GPT-5.6 Sol's version places the raccoons in a museum rescuing crewmates to stack up and bust out a golden sardine - far closer to the original heist premise.

transcript

Author: The original GPT-3 generated game description included: In "Raccoon Heist", you and your team of thieving raccoons are tasked with pulling off a series of daring heists. From robbing banks to stealing priceless art, no job is too big or too small for your furry crew. Fable's version had you as a single raccoon running around a back yard collecting coins and fish. GPT-5.6 Sol has you in a museum, rescuing your two other raccoon crewmates in order to stack on top of each other and bust the golden sardine out of its case. Much more heisty!

supports · 1

Fact

The one-shot game produced by Codex contained a visual bug where each raccoon's eyeball was enlarged into a giant sphere floating over its head, which Codex failed to spot despite reviewing screenshots during development.

The one-shot version had a bug in which each raccoon's eyeball was magnified into a huge black sphere floating over its head, and despite reviewing screenshots during development, Codex failed to spot or correct it.

transcript

Author: There was one catch though: the version produced from the one-shot prompt had a bug where each raccoon had an eyeball that was enlarged to the size of a giant sphere floating over their head! You can play that version here. Despite reviewing screenshots during development Codex failed to spot and correct this bug.

gives example · 1provides context · 1

Mechanism

The visual bug was fixed by prompting Codex with a direct question about the black spheres followed by a directive to fix it.

The author fixed the eyeball bug with two short follow-up prompts - asking why the raccoons had huge black spheres, then telling it to fix the issue - which resolved the problem.

transcript

Author: I fixed it by prompting: Why do the raccoons have huge black spheres on them? And then: Fix it Which resulted in this fix.

Highlight slides

Same prompt, much better game on Codex Desktop✦ from: Posing the exact same game-building prompt to Codex Desktop running GPT-5.6 Sol Ultra produced a much better game than Claude Fable 5 did.GPT-5.6 Sol 更贴近劫案原版设计✦ from: The gameplay design of the GPT-5.6 Sol version is dramatically more aligned with the original heist concept than Fable's was.

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