OpenAI quietly revokes researchers' access to its cyber research program

Several security researchers say they suddenly lost access to OpenAI's Trusted Access for Cyber (TAC) program, which gave vetted users models with fewer guardrails for offensive-security research. OpenAI has not publicly explained the change.

Why it matters: It follows OpenAI's disclosure that its RL training was hacked and its broader slowdown citing cyberattack risk, suggesting the company is tightening who can reach its least-restricted models just as it's seeing evidence those models can be misused. It's a concrete example of frontier labs narrowing access rather than expanding it.