PSA: ChatGPT Project instructions silently override your custom instructions
Ok_Negotiation_2587 · reddit · 2026-09-30
A useful PSA: inside a ChatGPT Project, project instructions apply only there and override your global custom instructions — so rules like 'be concise' quietly stop working without any visible cue. Shared projects go further: by design they don't access any member's custom instructions or memories. The author's fix: keep a short 3-5 item 'core rules' block, paste it atop every project's instructions, and check project settings before blaming the model when a chat misbehaves.
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