One password on the fridge looks easy. For ChatGPT (and most chatbots), sharing a login usually means shared memory, shared history, and mixed private asks. Usually: no. Give each person their own free account when you can.

Why shared logins go wrong

• Memory and history. Custom instructions, saved memories, and past chats can bleed across people. Your kid’s school paste and your work draft should not live in the same profile.
• “Who said that?” You cannot tell whose prompt trained a weird habit into the chat.
• Billing and locks. One person’s misuse can lock or bill the shared account.
• Age and school rules. A child may need different limits than an adult. Shared access skips that.

Free ChatGPT with GPT-6 Luna is enough for most family Tuesday jobs. You do not need one paid Astra seat that everyone squeezes into.

What to do instead

1. Each adult gets their own free login.
2. Kids: follow the product’s age rules and your school’s policy. Prefer school-managed tools when the district provides them.
3. Share prompts, not passwords. Keep a family Notes file of the email, photo, and study prompts from this site.
4. For a shared device, use separate browser profiles or apps signed into different accounts.
5. Turn on whatever PIN or device lock you already use so “quick ask” does not equal “open parent chat.”

Soft exceptions

A supervised session on a parent’s phone (“help me quiz for the test”) is fine if you watch the screen and do not leave the kid alone in your work history. That is borrowing a device, not sharing a life login.

Skip the shared account when anyone on it handles work email, medical, money, or dating. Skip pasting family secrets into a login your teen also uses. Privacy here is boring setup. Boring is the point.

Updated 11/4/26: Free ChatGPT now runs GPT-6 Luna (OpenAI moved Free and Go from GPT-5.6 Luna starting Oct 8), so we updated the model name.