How private are my documents in play ground and assistants

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You have a thought good enough that someone already asked.

File Security/Privacy in Playground

Even if the files are placed nowhere else except a temporary data store and then deleted, when the AI receives data from files and responds about them, that language data will be data retained for up to 30 days by OpenAI for policy enforcement and other internal requirements. API language data will not be used to train AI models.