Yes. Grok has memory across chats: xAI’s Grok product page lists “Memory across chats” as a feature and says Grok “remembers your preferences and past conversations.”
As of November 11, 2026, you can switch memory off in the Data Controls section of Grok’s settings, according to xAI’s published Grok system prompt. The same prompt says you can forget a referenced chat by clicking or tapping the book icon beneath a reply, and that deleting a conversation deletes the memories tied to it. The xAI pages checked for this answer do not state a memory size limit.
To keep a conversation out of your history, use Private Chat, the ghost icon at the top right of the screen. xAI’s consumer FAQ says Private Chat conversations are not viewable in your history and are deleted from its systems within 30 days. The “Improve the Model” switch is a different setting: it controls whether your content is used to train xAI’s models.
Related: Does Grok train on your data?, Does Claude have memory? and Does Gemini have memory?
Source: xAI, Grok product page; xAI, grok-prompts repository on GitHub; xAI, Consumer FAQ
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