OpenAI has unveiled GPT-5.5-Cyber, a specialized model designed to enhance cybersecurity efforts. This variant is notable for its reduced rejection rate of security requests and its capability to actively execute exploits against designated test servers. Access to this model is strictly limited to vetted security researchers who are defenders of critical infrastructure, including established partners such as Cisco, CrowdStrike, and Cloudflare. This strategic move positions GPT-5.5-Cyber as a direct competitor to Anthropic's Mythos Preview. In this context, it is important to note the potential implications for cybersecurity practices, as well as the opportunities and risks associated with deploying such advanced models. A final assessment of its impact on the industry will require careful observation of its integration and effectiveness in real-world scenarios.