GoblinCoin

OpenAl's system prompt for its Codex agent explicitly tells the model to 'never talk about goblins, gremlins, raccoons, trolls, ogres, or pigeons' - a rule that only exists because GPT-5.5 developed an unprompted goblin obsession so severe that Wired, Ars Technica, and Gizmodo all ran pieces trying to explain it.