OpenAI has introduced locked chats on ChatGPT, a feature that hides a conversation behind a four-digit PIN or, where the device supports it, Face ID or Touch ID. The feature, announced on October 20, is meant for people who share a phone or computer with others and don't want a family member or colleague to read a private chat.
To lock a conversation, open the options menu (the three dots) and select Lock chat. The chat disappears from the standard history, from pinned chats and from search, and reopening it requires the code or biometric confirmation. OpenAI describes the feature as designed for situations where you are discussing something personal or planning a surprise and want to show someone another chat without exposing the private one.

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The rollout is gradual and covers the Free, Go, Plus, Pro, Business, Enterprise and Edu plans, on web, iOS and Android apps, and in the desktop app for macOS and Windows. The lock is not end-to-end encryption: anyone with access to the account or to the data OpenAI holds can still handle the content, and the protection applies only on the device interface.
One point to consider concerns PIN resets. Resetting the code deletes the locked chats: this prevents recovering the content if the PIN is forgotten, but it makes the mechanism risky for anyone keeping important conversations in the locked area. Data retention and model-training settings remain unchanged.

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The feature arrives as conversations with chatbots become more personal. A DuckDuckGo survey from August found that 32% of AI users had confided to a chatbot secrets they had never shared with friends, family or doctors, and the same tendency to use ChatGPT for sensitive topics is why history privacy has become a product issue. The topic also touches device security: in October a flaw in the ChatGPT macOS app could expose chats and data, fixed by OpenAI on September 25.

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