simon_willison ยท Apr 28, 2026 ยท news
Quoting OpenAI Codex base_instructions
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. โ OpenAI Codex base_instructions , for GPT-5.5 Tags: openai , ai , llms , system-prompts , prompt-engineering , codex-cli , generative-ai , gpt