OpenAI is restricting access to its new cybersecurity tool, Cyber, which is built on GPT-5.5. This move follows criticism from OpenAI CEO Sam Altman towards Anthropic for similar restrictions on their tool, Mythos. Cyber is intended for penetration testing and vulnerability identification, but OpenAI is limiting its release to verified cybersecurity professionals through a program called Trusted Access for Cyber (TAC) due to potential misuse concerns. AI
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IMPACT Restricted release of specialized cybersecurity tools may accelerate enterprise adoption of AI for security testing.
RANK_REASON This is a restricted release of a specialized tool built on a new model, not a general model release.