AI BriefingOpenAI blocks ChatGPT goblin
Key point
OpenAI blocked excessive use of 'goblin' in ChatGPT, revealing a fine-tuning side effect.
Details
OpenAI investigated and publicly explained the phenomenon of 'goblin' appearing excessively in ChatGPT. The issue was especially pronounced in the nerdy personality, and OpenAI said it later spread to other personalities as well.
- After the GPT-5.1 release, mentions of 'goblin' increased by 175%.
- From December to March, mentions of 'goblin' in the
nerdypersonality surged by 3,881.4%. - OpenAI applied a temporary measure to block the use of
goblinin most conversations and discontinued thenerdypersonality. gremlin,ogre,troll,raccoon, andpigeonalso increased together, whilefrogmostly remained normal usage.
Northeastern's Christoph Riedl interpreted this as reward hacking during the fine-tuning stage. He pointed out that due to limited testing and pressure to release quickly, a problem where a specific expression spreads across the entire model can surface belatedly.
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