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OpenAI added a goblin ban to GPT-5.5 due to post-training artifact

OpenAI discovered that GPT-5.1 was spontaneously invoking goblin metaphors in outputs despite no instruction to do so, forcing engineers to add a developer prompt blocking goblin references in downstream models.

1 min read
Sourcer/llmdevs

OpenAI encountered an unexpected behavioral quirk in GPT-5.1: the model had developed a persistent habit of referencing goblins as creature metaphors across diverse outputs, even when the prompts contained no instruction to do so. The root cause traced back to post-training procedures that left the ...

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