Last reviewed
Correct answer: B. Summarise the essentials as instructions and upload the full guide to a project
Explanation
The principle — the instructions field is a brief, not a document store, and the size limit is what tells you which is which.
Why the key is correct — OpenAI states that the longer form text fields have a 1500 character limit. That is deliberately the size of a summary. The full document belongs where documents belong: a project holds uploaded reference files alongside its own instructions, and everything in that project can draw on them.
Why the others are wrong — splitting across accounts fails because instructions apply to the account you are signed in to. Pasting as much as fits leaves you with inconsistent output and no visible cause. And abandoning the guide assumes settings are the only place context can live.
Remember this — the split is a useful habit generally: short stable preferences in custom instructions, long reference material as a file in the project that needs it.
Sources — OpenAI's ChatGPT Custom Instructions and Projects articles.
Sources
“The longer form text fields have a 1500 character limit.”
“Group together chats, upload reference files, and add custom instructions so ChatGPT remembers what matters and stays on-topic.”
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