OpenAI Expands Access to Cybersecurity-Focused AI Model GPT-5.4-Cyber

OpenAI has expanded access to its cybersecurity-focused AI model, GPT-5.4-Cyber, which is fine-tuned to assist cybersecurity defenders. The move follows Anthropic’s recent unveiling of its Mythos cybersecurity model. GPT-5.4-Cyber is designed to lower barriers for legitimate cybersecurity operations. No specific technical details, release dates, or impact metrics were provided in the announcement. The development reflects ongoing competition in AI-driven cybersecurity tools between major providers.