Is ChatGPT safe to use?
The short answer
Yes, for everyday questions, as long as you treat it as a service that keeps what you type. On the personal plans, OpenAI may train on your conversations unless you opt out. Turn off "Improve the model for everyone" under Settings, Data controls, and keep passwords, ID numbers and client files out.
In detail
OpenAI spells it out on its policy page: ChatGPT "improves by further training on the conversations people have with it, unless you opt out." That applies to the personal plans, from Free up to Pro.
Part of what you type is also kept. OpenAI says it retains certain data from your interactions and takes steps to reduce the personal information in its training sets. Reducing is not removing, so treat anything you paste in as stored.
To switch training off on the web, open your account menu, choose Settings, then Data controls, and turn off "Improve the model for everyone." In the app, tap your profile icon to reach the same screen. Signed in, the choice applies on every device (OpenAI help center, read on 22 September 2026).
The switch has two limits. It only covers new conversations, and it deletes nothing: older chats stay in your history until you remove them yourself. And if you rate an answer with a thumbs up or down, OpenAI may still use that whole conversation for training.
For a single sensitive question, pick Temporary Chat from the dropdown in ChatGPT. Those chats stay out of your history, do not update memory and are not used for training. OpenAI may keep them for up to 30 days for safety reasons, so private is not the same as gone.
Business accounts work differently. OpenAI does not train on content from ChatGPT Business, Enterprise or the API unless the organization opts in. That protection belongs to the company account, though: paste a client file into your personal ChatGPT and the personal rules apply.
Would you rather not depend on a setting? Some assistants skip training by design. Proton's Lumo keeps your chats out of model training and encrypts saved conversations so that Proton cannot read them. Duck.ai from DuckDuckGo is free, needs no account and does not use prompts or answers for training.
So ChatGPT is safe enough for drafts, questions and brainstorming. The risk sits in what you feed it, so decide before you start typing which details stay out.