OpenAI Launches GPT-5.4-Cyber and Updates Cybersecurity Approach

Wed, 15 Apr 2026 01:53:00 +0200

OpenAI announced its new cybersecurity strategy alongside the release of GPT-5.4-Cyber, a model designed for digital defense. The announcement comes shortly after competitor Anthropic introduced its Claude Mythos Preview, which is being privately released due to potential cybersecurity risks. OpenAI emphasizes that its current safeguards reduce cyber risk sufficiently for now, while acknowledging the need for more robust measures as AI capabilities grow. The company outlines three main pillars of its cybersecurity strategy: first, 'know your customer' systems for controlled model access; second, iterative deployment that allows real-world testing and refinement, particularly against jailbreaks and adversarial attacks; and third, investment in software security and digital defense initiatives. OpenAI’s broader security efforts include the Codex Security AI agent, a cybersecurity grants program, contributions to the Linux Foundation, and the Preparedness Framework for assessing risks fro