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Simon Willison Blog·Model·1d ago·~1 min read

Quoting OpenAI Codex base_instructions

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

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