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Lockdown Mode | OpenAI Help Center
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OpenAI's Lockdown Mode is a vendor-provided defensive control aimed at blocking the final data-exfiltration stage of prompt-injection attacks against ChatGPT and its agentic capabilities, giving defenders a mitigation option for sensitive workloads.
OpenAI documented Lockdown Mode, an optional advanced security setting for ChatGPT that limits outbound network requests to reduce data exfiltration risk from prompt injection attacks. The feature disables or restricts live web browsing, image retrieval, deep research, agent mode, Canvas networking, and file downloads, but does not prevent prompt injections from appearing in processed content.