OpenAI Builds the Blast Door Into the Agent Stack

OpenAI has made Lockdown Mode available as an opt-in advanced security setting for ChatGPT, with rollout details varying by account type and workspace. The feature limits or disables network-enabled capabilities such as live browsing, deep research, agent mode, file downloads, some web-derived image support, and certain connector actions to reduce prompt-injection-based data exfiltration risk. The Pattern Nexus read: the AI economy is shifting from model intelligence alone toward controlled runtime architecture, where egress, permissions, and side effects become core security primitives.