GPT-5.4-Cyber

OpenAI and Anthropic held classified briefings with the House Homeland Security Committee to discuss their new cyber-capable AI models and their implications for national security. Anthropic delayed the release of its Mythos Preview model due to security risks, while OpenAI adopted a tiered approach for its GPT-5.4-Cyber model. Both companies are collaborating with federal agencies to assess the models' cybersecurity risks.

U.S. Cyber Command is prioritizing the deployment of the most capable AI models for cyber operations, regardless of political or geographic origins, while navigating challenges with Anthropic's restricted models and competing with OpenAI's GPT-5.4-Cyber. The command is building flexible infrastructure to swap AI models and received dedicated AI funding starting in 2026.

OpenAI has been briefing U.S. federal agencies, state governments, and Five Eyes allies on its new GPT-5.4-Cyber model, which offers advanced cybersecurity capabilities. The company is using a tiered access program with vetting for government and commercial users, while Anthropic's competing Mythos model faces restrictions due to Pentagon concerns.

OpenAI has launched GPT-5.4-Cyber, a cybersecurity-focused variant of its GPT-5.4 model, aimed at enhancing defensive capabilities for security teams. The release follows Anthropic's recent launch of its Mythos model, highlighting competitive advancements in AI for security applications.

OpenAI is expanding access to its GPT-5.4-Cyber model for defensive cybersecurity tasks while implementing verification controls. The company emphasizes balancing wide availability with preventing misuse, contrasting its approach with Anthropic's more restrictive rollout strategy.

OpenAI has introduced GPT-5.4-Cyber, a new cybersecurity-focused model, claiming its safeguards sufficiently reduce cyber risk. The development comes in the wake of Anthropic's Mythos model, highlighting advancements in AI-driven cybersecurity solutions.