GPT-5 has a hidden system prompt

GPT-5 has a hidden system prompt(simonwillison.net)

9 points by gronky_ 275 days ago | 2 comments

Of course it does. Do you really think you have full control over API output? Do you really think "the system prompt you can specify in an API call" is the system prompt and not the developer instructions prompt?

suspended_state 275 days ago | |

I think the definitive point is that it should be documented. Security through obscurity all by itself isn't security.

slacktivism123 275 days ago |

Of course it does. Do you really think you have full control over API output? Do you really think "the system prompt you can specify in an API call" is the system prompt and not the developer instructions prompt?

suspended_state 275 days ago | |

I think the definitive point is that it should be documented. Security through obscurity all by itself isn't security.