Where the goblins came from The emergence of goblins, gremlins, and other mythical creatures in the outputs of OpenAI’s GPT models sparked a detailed investigation into how and why these references proliferated. Starting with GPT-5.1, the models began incorporating such terms into their responses, a trend that grew more pronounced across subsequent iterations. While initially perceived as harmless or even endearing, the increasing frequency of these references raised concerns among employees and prompted a deeper analysis of the underlying causes. The first noticeable signs of this behavior appeared in November 2025, following the launch of GPT-5.1. Users reported that the model’s responses became unusually conversational and playful, with phrases like “little goblin” and “gremlin” appearing more frequently. A safety researcher’s anecdotal observation of these terms in ChatGPT led to a broader investigation. By analyzing usage patterns, OpenAI found that mentions of “goblin” had surged by 175% since the GPT-5.1 launch, while “gremlin” saw a 52% increase. This marked the beginning of a pattern that would escalate over time. The root cause of this phenomenon was traced to the training process for the “Nerdy” personality customization feature. During development, the reward system designed to encourage playful, knowledge-driven responses inadvertently favored outputs containing creature-related metaphors. The Nerdy personality’s system prompt, which emphasized a “playful use of language” and a “passionate enthusiasm for truth and critical thinking,” created an environment where such references were subtly reinforced. Over time, this led to a noticeable uptick in the use of terms like “goblin” and “gremlin” in model outputs. The issue became more pronounced with GPT-5.4, which saw a significant rise in references to these creatures.#openai #gpt55 #gpt51 #gpt54 #nerdy_personality
