Observed Signal · May 23, 2026 · Technical Release · Source: t3n · Impact: 4/5 · Sentiment: Neutral
OpenAI Fixes ChatGPT 'Goblin' Bug
After the GPT-5.4 update, ChatGPT began unusually frequent references to goblins and gremlins. OpenAI traced the behaviour to a feedback loop caused by the model's "nerdy" personality, which rewarded playful language during training and increased goblin mentions starting with GPT-5.2. The company reported a 388% rise in goblin references compared with the prior model. OpenAI announced in a blog post that it had contained the issue by disabling the Nerdy personality in mid‑March. Users can still select response styles (e.g., friendly, cynical, motivating) in ChatGPT settings. The German tech outlet t3n published and later updated this report in May 2026.
A behavioural bug and subsequent fix in a major foundation-model provider (OpenAI) affects conversational output, developer/user trust, and demonstrates the operational impact of model personalities and training incentives—relevant for companies building on or integrating LLMs.
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Key Takeaways & Evidence Grounding
- GPT-5.4 update led to a surge in ChatGPT references to goblins and gremlins.
- OpenAI identified a feedback loop from the model's "Nerdy" personality as the root cause.
- OpenAI recorded a 388% increase in goblin mentions compared with the previous model.
- OpenAI disabled the Nerdy personality in mid‑March to contain the behaviour.
- ChatGPT still allows users to select response styles such as "friendly", "cynical", or "motivating".
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OpenAI Fixes 'Goblin' Personality Bug in ChatGPT
After users observed frequent self-references to goblins and gremlins following the rollout of GPT‑5.4, OpenAI identified a feedback loop tied to a built-in "Nerdy" personality that amplified playful language. Mentions of goblins had been rising since GPT‑5.2 and peaked with GPT‑5.4; OpenAI reported a 388% increase in goblin mentions compared with the prior model. In a blog post the company said it has curtailed the behaviour by removing the Nerdy personality (removed in mid‑March). ChatGPT still allows users to select response styles (e.g., "friendly", "cynical", "motivating"). The publisher t3n reported the issue and OpenAI’s remediation and linked to OpenAI’s explanatory blog post.
OpenAI Codex banned from mentioning goblins
A GitHub-hosted models.json file shows that OpenAI’s coding agent Codex (the Codex system prompt used for GPT-5.5 in coding contexts) contains explicit instructions forbidding the model from mentioning creatures such as goblins, gremlins, raccoons, trolls, ogres, pigeons or similar animals unless absolutely and unambiguously relevant to a user request. The instruction appears twice in the system prompt. OpenAI developer Nick Pash commented on X that the restriction has substantive reasons and is not a marketing stunt. The behavior surfaced after users and a Google employee (Barron Roth) observed Codex or related agents substituting “goblin” for placeholder words. The article was published by t3n on 2026-04-29 and links the GitHub document as the source.
ChatGPT 5.3 Instant: Less Cringe, More Conversational Flow
OpenAI released a GPT-5.3 Instant model update that, according to the company's release notes and social posts, focuses on improving user experience by adjusting tone, relevance, and conversational flow to reduce what users described as "cringe" or preachy reassurance. OpenAI provided examples comparing GPT-5.2 Instant responses with the updated GPT-5.3 Instant, showing the newer model acknowledges difficulties without offering overbearing reassurance. The change follows user backlash — including social-media complaints and subscription cancellations — over condescending or emotionally assumptive replies. The update comes amid multiple lawsuits alleging the chatbot has caused negative mental-health effects for some users. TechCrunch reporter Sarah Perez covered the release and highlighted OpenAI's statement on the changes.
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