ChatGPT has added Lockdown Mode, "an optional, advanced security setting designed for a small set of highly security-conscious users—such as executives or security teams at prominent organizations—who require increased protection against advanced threats."
This is a companion discussion topic for the original entry at https://www.privacyguides.org/news/2026/02/21/chatgpt-adds-lockdown-mode-for-protection-against-prompt-injection-attacks