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OpenAI Restricts Access to GPT-5.5 Cyber Tool Despite Criticizing Anthropic's Similar Approach

OpenAI is limiting access to its new cybersecurity tool, GPT-5.5 Cyber, releasing it only to "critical cyber defenders" through an application process, despite CEO Sam Altman previously criticizing Anthropic for taking the same approach with its Mythos tool. The tool can perform penetration testing, vulnerability identification, and malware reverse engineering, with concerns about potential misuse by malicious actors. OpenAI is consulting with the U.S. government to eventually expand access to verified cybersecurity professionals.