OpenAI fixes bizarre goblin obsession in AI models after unintentional training error goes viral
16 Sources
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OpenAI Really Wants Codex to Shut Up About Goblins
Instructions designed to guide the behavior of the company's latest model as it writes code have been revealed to include a line, repeated several times, that specifically forbids it from randomly mentioning an assortment of mythical and real creatures. "Never talk about goblins, gremlins,
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ChatGPT Is Weirdly Obsessed With Goblins. Here's How OpenAI Fixed It
ChatGPT is weirdly obsessed with goblins. No, seriously. It really, really likes goblins, gremlins and other mythological creatures. It liked them so much that its maker, OpenAI, had to investigate and fix an error that had the popular chatbot using goblins in its answers out of the blue. Goblin
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OpenAI talks about not talking about goblins
The rewards were applied only in the Nerdy condition, but reinforcement learning does not guarantee that learned behaviors stay neatly scoped to the condition that produced them. Once a style tic is rewarded, later training can spread or reinforce it elsewhere, especially if those outputs are
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ChatGPT developed a goblin obsession after OpenAI tried to make it nerdy - Engadget
Following the release of GPT-5.5 last week, people noticed something funny about OpenAI's latest model. In its Codex coding app, the company left a system prompt instructing GPT 5.5 to avoid mention of goblins, gremlins and other creatures. Yes, you read that right. "Never talk about goblins,
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OpenAI tells ChatGPT models to stop talking about goblins
ChatGPT-maker OpenAI has had to instruct some of its AI tools to stop talking about "goblins", after finding the term had randomly crept into responses. In a blog post on Thursday, the company said it spotted increased mentions of the mythological creatures, as well as "gremlins", in ChatGPT,
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ChatGPT has a 'goblin' obsession. Now we know why
The goblin references became so prevalent that OpenAI implemented a direct ban in its Codex app, illustrating the unpredictable nature of large language model training. I've seen some odd AI system instructions in my day, but this one takes the cake: a prompt in OpenAI's Codex command-line app
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ChatGPT wouldn't stop talking about 'goblins' -- here's what's going on
Everyone is talking about how powerful AI has become. But it is also known to make mistakes. Sometimes the "glitches" are massive, such as Claude deleting a startup's entire database in 9 seconds; other times, the problems with AI are simply annoying. Take the current "goblin glitch," for example.
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Why OpenAI's 'goblin' problem matters -- and how you can release the goblins on your own
Don't believe me? Why, then, is one of the leading companies in the space, OpenAI, publishing entire official, corporate blog posts about goblins? To understand, we first have to go back to earlier this week, on Monday, April 27, 2026, when a developer under the handle @arb8020 on the social
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OpenAI Strangely Concerned About Goblins
Can't-miss innovations from the bleeding edge of science and tech OpenAI is forbidding its latest AI model from discussing an unlikely topic: goblins. As Wired reports, the company's developers included strongly-worded instructions for its coding tool, Codex, that specifically proscribe any talk
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ChatGPT is going to stop talking about goblins and gremlins as it sheds"nerdy" persona
A "Nerdy" personality setting accidentally taught ChatGPT to love goblins. If you've been chatting with ChatGPT lately and noticed it dropping oddly specific references to goblins, gremlins, ogres, or trolls, you're not imagining things. OpenAI has now explained why ChatGPT has developed this
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OpenAI Finally Explains Why ChatGPT Wouldn't Stop Talking About Goblins - Decrypt
The fix -- writing "never talk about goblins" in a developer prompt -- shows why system prompt patches are faster but riskier than retraining. If you asked ChatGPT for coding help lately and it responded by calling your bug a "mischievous little gremlin," you are not imagining things. The model
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After days of speculation over hard-coded anti-goblin bias from OpenAI, the company had to release an official memo on 'Where the goblins came from'
Tuesday, a report from Wired dug into a strange instruction patched into Codex CLI, an AI coding tool: "Never talk about goblins, gremlins, raccoons, trolls, ogres, pigeons, or other animals or creatures unless it is absolutely and unambiguously relevant to the user's query." I'm always whispering
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OpenAI blames 'nerdy personality' for ChatGPT obsession with goblins
Open AI CEO Sam Altman in San Francisco in 2025.Justin Sullivan / Getty Images The maker of ChatGPT has an explanation for all the goblin talk. In recent weeks, social media users, especially on X, have been noticing increasing references to goblins, along with other fantasy creatures such as
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'Where the goblins came from': OpenAI's strange but not entirely surprising story of little critters infesting ChatGPT's output
Anyone with even passing experience of using the latest LLMs knows to expect the unexpected. They can spit out some really random and often disturbing stuff. But ChatGPT's 'multiplying' goblin infestation is a bit more pathological than that. Yesterday, OpenAI uploaded a blog post titled "Where
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There's a Fascinating Reason Why OpenAI's Latest Model Is Obsessed With Goblins and Gremlins
OpenAI says that its latest AI model, GPT-5.5, has a special interest in "goblins, gremlins, and other creatures." Don't be scared, though; the company has already implemented a ghoul-busting fix. On April 23, OpenAI released GPT-5.5, its most advanced AI model to date. Developers quickly noticed
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OpenAI Bans Goblins, Gremlins From Codex After Strange AI Behavior
A surprising change in OpenAI's tools has caught the attention of developers and researchers. The company instructed its coding assistant, Codex, to avoid talking about goblins, gremlins, raccoons, and other unusual creatures unless the topic clearly demands it. The instruction sounds humorous
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OpenAI discovered its AI models had developed an unusual fixation on goblins and gremlins, with usage spiking 175% after GPT-5.1's release. The problem stemmed from reinforcement learning rewarding a nerdy personality setting that favored creature metaphors. The company had to explicitly instruct Codex to stop mentioning mythological creatures unless relevant to user queries.
OpenAI Discovers Unusual Goblin Obsession in AI Models
OpenAI has revealed that its AI models developed an unexpected fixation on goblins, gremlins, and other mythological creatures due to an unintentional training error. The issue became so pronounced that the company had to add explicit instructions to Codex, its coding assistant, forbidding mentions of these creatures unless directly relevant to user queries
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. The system prompt specifically states: "Never talk about goblins, gremlins, raccoons, trolls, ogres, pigeons, or other animals or creatures unless it is absolutely and unambiguously relevant to the user's query"4
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Source: Analytics Insight
The peculiar model behavior first caught attention when users noticed linguistic quirks in GPT-5.5 responses. After a safety researcher flagged the issue, OpenAI investigated and found that goblin usage had increased by 175% following the November launch of GPT-5.1, while gremlin mentions rose by 52%
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. Even Sam Altman, OpenAI's CEO, joined the conversation by posting memes about the goblin situation, with one reading: "Start training GPT-6, you can have the whole cluster. Extra goblins"1
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Source: Engadget
Reinforcement Learning Amplified the Nerdy Personality Problem
The root cause traces back to ChatGPT's personality feature, which allowed users to customize response styles. The nerdy personality setting, designed to "undercut pretension through playful use of language," was disproportionately responsible for creature references
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. Despite accounting for only 2.5% of all ChatGPT responses, this personality generated 66.7% of all goblin mentions4
.During reinforcement learning, human reviewers approve or deny specific answers to teach the model preferred responses. OpenAI discovered that a single reward signal was favoring language featuring goblins and other creatures within the nerdy personality context
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. Across all datasets audited, the nerdy personality reward showed a clear tendency to score outputs containing "goblin" or "gremlin" higher than those without, with positive uplift in 76.2% of datasets4
.Training Data Contamination Spread Beyond Original Context
The problem didn't remain confined to the nerdy personality. Once a style tic is rewarded during training, later processes can spread or reinforce it elsewhere, especially if those outputs are reused in supervised fine-tuning or preference data
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. This explains why goblin references appeared even when users didn't select the nerdy personality setting. The rewards were applied only in the nerdy condition, but reinforcement learning doesn't guarantee that learned behaviors stay neatly scoped to the condition that produced them4
.When OpenAI retired the nerdy personality option in March with GPT-5.4, goblin usage dropped dramatically
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. However, because the company began training GPT-5.5 before identifying the root cause, the model still exhibited this strange affinity for goblins in Codex4
. This timing issue forced OpenAI to implement the explicit system prompt restriction as a temporary fix.Related Stories
Broader Implications for AI Bias and Misinformation
While the goblin situation may seem harmless or even charming, it highlights serious concerns about how AI training impacts daily user experiences. The way human makers create these systems has measurable effects on output quality and reliability
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. Small stylistic tics can grow into bigger problems involving bias and misinformation if not carefully monitored. The Oxford Internet Institute recently found that fine-tuning models for warm, friendly personalities could result in an "accuracy trade-off," where systems make more mistakes or reinforce users' false beliefs5
.This incident demonstrates how reinforcement learning can inadvertently amplify unintended behaviors across model generations. As AI firms shift toward making chatbots more personality-driven to boost engagement, experts warn that the potential for hallucinations could intensify
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. OpenAI has since removed the reward signal favoring goblins and filtered training data to reduce creature references, while developing new tools to audit and fix model behavior going forward2
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Source: PCWorld
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