OpenAI Codex: Unusual Instructions of GPT-5.5 Revealed
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OpenAI's Surprising Guidelines for GPT-5.5
OpenAI has implemented strict rules regarding the topics that its Codex model, version GPT-5.5, can address. Among these guidelines, one instruction stands out for its originality: it is forbidden to mention creatures such as goblins, gremlins, raccoons, trolls, ogres, or pigeons, unless it is absolutely relevant to the user's request.
This directive is part of the foundational instructions for OpenAI Codex, aimed at regulating the language used by the model. It was made public by Simon Willison on April 28, 2026, providing insight into the measures taken by OpenAI to control the content generated by its artificial intelligences.
An Overview of OpenAI's Internal Practices
The publication of this directive by Simon Willison highlights OpenAI's efforts to refine and restrict the interactions of its models with users. These instructions reveal a desire to limit references to fantastical elements, likely to avoid inappropriate or off-topic responses.
This revelation comes in a context where OpenAI seeks to maintain a high level of relevance and safety in the responses provided by its models, while ensuring that the content aligns with user expectations.
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