OpenAI Counters Anthropic with Release of GPT-5.4-Cyber AI Model

OpenAI grants limited access to GPT-5.4-Cyber for software vulnerability detection.

OpenAI has granted a limited number of users access to its new AI model, GPT-5.4-Cyber, which is positioned as an effective tool for identifying software vulnerabilities.

We’re expanding Trusted Access for Cyber with additional tiers for authenticated cybersecurity defenders.

Customers in the highest tiers can request access to GPT-5.4-Cyber, a version of GPT-5.4 fine-tuned for cybersecurity use cases, enabling more advanced defensive workflows.…

— OpenAI (@OpenAI) April 14, 2026

OpenAI is expanding its Trusted Access for Cyber program, launched in February. The initiative involves verifying individuals and collaborating with a select group of organizations to provide models with “more liberal cybersecurity restrictions.”

Additional access tiers have been added for users wishing to verify their qualifications as cybersecurity specialists.

Clients with the highest status will have access to GPT-5.4-Cyber, a specialized model with enhanced functionality and fewer basic restrictions.

“This is a version of GPT-5.4 that lowers the threshold for legitimate work in cybersecurity and unlocks new capabilities for advanced defensive workflows,” the announcement states.

Among the additional features of the neural network is reverse engineering of binary files. This allows experts to analyze compiled software for vulnerabilities and malicious code, as well as assess the overall level of protection without direct access to the source code.

The tool was introduced a week after the high-profile announcement of Mythos. Anthropic declined to release the model publicly due to its advanced vulnerability-finding capabilities and high security risks.

To use GPT-5.4-Cyber, users must verify their identity, and organizations must request access through their representative.

In April, OpenAI introduced a plan aimed at strengthening child safety systems amid the widespread adoption of artificial intelligence and technology misuse.