Shared from twixb · simonwillison.net

Quoting OpenAI Codex base_instructions

simonwillison.net·Apr 28, 2026

Simon Willison's weblog features a recent quote from OpenAI Codex's base instructions for GPT-5.5, emphasizing the importance of relevance in responses, particularly avoiding unnecessary references to fictional creatures unless pertinent to user queries. The site also highlights upcoming articles and events related to AI and coding.

The most relevant insight for you is the OpenAI Codex base instruction for GPT-5.5, highlighting the importance of relevance in prompt engineering: "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." This underscores the need for precise and contextually appropriate prompts to enhance AI coding and productivity.

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