GPT-5 has a hidden system prompt (opens in new tab)

(simonwillison.net)

9 pointsgronky_7mo ago2 comments

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_state7mo ago

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

j / k navigate · click thread line to collapse

2 comments

slacktivism1237mo ago

suspended_state7mo ago

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

j / k navigate · click thread line to collapse