GPT-5.4-Cyber

Overview

GPT-5.4-Cyber is a domain-specialised AI model from OpenAI released in April 2026, derived from GPT-5.4 and optimised for cybersecurity workflows. It is available exclusively through OpenAI's Trusted Access for Cyber programme, designed to assist vetted cyber defenders — including security engineers, incident responders, and vulnerability researchers.

For engineering teams with security responsibilities, GPT-5.4-Cyber offers deep threat reasoning capabilities relevant to dependency security: understanding the exploitability of known CVEs, generating security advisories, and reasoning about attack surfaces introduced by third-party libraries.

Key Capabilities

• Cybersecurity Reasoning — deep domain knowledge across vulnerability types, attack techniques, and defensive strategies
• Incident Response Support — reason through security incidents and generate structured response playbooks
• Threat Analysis — analyse threat intelligence reports and map findings to your environment
• Vulnerability Assessment — evaluate CVE advisories against specific technology stacks and configurations
• Security Code Review — identify security weaknesses in code and dependency configurations

Use Cases for Engineering Teams

• Dependency CVE Triage — reason about the exploitability and impact of vulnerabilities in project dependencies
• Security Advisory Generation — create clear, actionable security advisories for dependency vulnerabilities
• Incident Root Cause Analysis — trace security incidents to specific dependency versions or configuration changes
• Attack Surface Assessment — evaluate the security exposure introduced by third-party library additions
• Compliance Workflow Support — assist with security-focused compliance reviews of technology stacks

Technical Specifications

• Context Window: Not publicly specified
• Pricing: Available under Trusted Access for Cyber (pricing not public)
• Open Weight: No
• Release Date: 2026-04-14

Provider

GPT-5.4-Cyber is developed by OpenAI. Access requires approval through the Trusted Access for Cyber programme. For the latest information, visit the official documentation.