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GPT-5 Has a Hidden System Promptsimonwillison.net/2025/Aug/15/gpt-5-has-a-hidden-system-prompt/
140 sats \ 2 comments \ @Tony 18h AI
It looks like GPT-5 when accessed via the OpenAI API may have its own hidden system prompt, independent from the system prompt you can specify in an API call.
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0 sats \ 1 reply \ @SimpleStacker 15h
Ok, what is juice: 64?
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30 sats \ 0 replies \ @Tony OP 15h
Juice is a unit of reasoning effort. Maxes out at 200.
For reference, GPT-5 Pro is set to juice=128
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