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Quoting OpenAI Codex base_instructions

Simon Willison's Blog / 4/29/2026

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Key Points

  • Simon Willison’s Weblog posts a quotation from OpenAI Codex “base_instructions” (for GPT-5.5), including guidance to avoid mentioning certain creatures (e.g., goblins, gremlins, trolls) unless the user’s query clearly requires it.
  • The quoted instruction reflects a broader system-prompt style aimed at keeping responses tightly relevant to the user’s request rather than injecting irrelevant fantasy or animal references.
  • The post is presented as a collected reference to OpenAI Codex’s internal instruction text rather than as an explanation or new release.
  • The article is tagged with themes around AI, OpenAI, prompt engineering, generative AI, LLMs, and system prompts, positioning it as a prompt-engineering/system-prompt signal.
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28th April 2026

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.

— OpenAI Codex base_instructions, for GPT-5.5

Posted 28th April 2026 at 10:02 pm

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