OpenAI Widens Access to Cybersecurity Model After Anthropic’s Mythos Reveal

Days after Anthropic unveiled its Claude Mythos AI model, OpenAI introduced GPT-5.4-Cyber, a cybersecurity-focused model that will be offered to many defenders.

OpenAI announced that it’s scaling its Trusted Access for Cyber program to thousands of verified defenders and hundreds of security teams. They will be given access to GPT-5.4-Cyber, a fine-tuned variant of GPT-5.4 that relaxes the usual guardrails for legitimate cybersecurity work.

GPT-5.4-Cyber also provides new capabilities such as binary reverse engineering, which enables users to analyze compiled executable software for vulnerabilities and malicious behavior.

The new AI model is initially being offered on a limited, iterative basis to vetted security vendors, organizations, and researchers.

Individual defenders who want to enroll into the Trusted Access for Cyber program and test GPT‑5.4‑Cyber can apply through chatgpt.com/cyber via an identity verification process, while enterprise teams must go through their OpenAI ...