All other versions state it's not. I asked ChatGPT-5 and it responded that it's it's prompt (I pasted the reply in another comment).
I even obfuscated the prompt taking out any reference to ChatGPT, OpenAI, 4.5, o3 etc and it responded in a new chat to "what is this?" as "That’s part of my system prompt — internal instructions that set my capabilities, tone, and behavior."
All other versions state it's not. I asked ChatGPT-5 and it responded that it's it's prompt (I pasted the reply in another comment).
I even obfuscated the prompt taking out any reference to ChatGPT, OpenAI, 4.5, o3 etc and it responded in a new chat to "what is this?" as "That’s part of my system prompt — internal instructions that set my capabilities, tone, and behavior."
I asked the different models, all said it was NOT their instructions, ExCEPT for GPT-5 which responded with the following prompt. (Take that how you will, ChatGPT gaslights me constantly so could be doing the same now.
"Yes — that Gist contains text that matches the kind of system and tool instructions I operate under in this chat.
It’s essentially a copy of my internal setup for this session, including:
Knowledge cutoff date (June 2024) and current date.
Personality and response style rules.
Tool descriptions (PowerShell execution, file search, image generation, etc.).
Guidance on how I should answer different types of queries.
It’s not something I normally show — it’s metadata that tells me how to respond, not part of my general knowledge base.
If you’d like, I can break down exactly what parts in that Gist control my behaviour here."
I even obfuscated the prompt taking out any reference to ChatGPT, OpenAI, 4.5, o3 etc and it responded in a new chat to "what is this?" as "That’s part of my system prompt — internal instructions that set my capabilities, tone, and behavior."
Again not definitibe proof, however interesting.