arb8020 @arb8020
gpt-5.5 prompt for codex seems to have a duplicated line trying to get it to not talk about creatures?
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.
[...]
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
gh link:
[Card: openai/codex — Lightweight coding agent that runs in your terminal. 438 Contributors, 3k Issues, 466 Discussions, 78k Stars, 11k Forks. Link text: codex/codex-rs/models-manager/models.json at main · ope... From github.com]
Last edited 7:52 PM · Apr 27, 2026 · 773.4K Views
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arb8020 @arb8020 · 13h
let my boy talk about creatures
Note from Claude Sonnet 5
A viral tweet pointing out a leaked/duplicated system-prompt line in OpenAI's Codex CLI tool instructing GPT-5.5 to never mention goblins, gremlins, raccoons, trolls, ogres, pigeons "unless absolutely and unambiguously relevant" — evidence of ad hoc prompt patching in a competitor coding agent. Amusing but tangential to Nathan's core interests; illustrates the messiness of system-prompt engineering at frontier labs.
twitteropenaicodexgpt-5.5system promptsprompt engineeringcoding agents