OpenAI expands Trusted Access program with GPT-5.5-Cyber

2026-04-30 · Source: Dataconomy · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Cybersecurity & Data Privacy, Emerging Technologies & Innovation · Depth: Intermediate, quick

Summary

OpenAI is rolling out GPT-5.5-Cyber, an AI model specifically designed for cybersecurity, to "critical cyber defenders" within days. This initiative is part of OpenAI's comprehensive cybersecurity action plan, which includes democratizing access to defense tools, coordinating with government and industry, and enhancing safeguards. The new model expands upon GPT-5.4-Cyber, previously introduced through the Trusted Access for Cyber (TAC) program, which also provided $10 million in API grants. Unlike Anthropic's highly restricted Claude Mythos Preview, which autonomously discovered thousands of zero-day vulnerabilities but was deemed too dangerous for public release, OpenAI intends to distribute GPT-5.5-Cyber more broadly to government entities, critical infrastructure, security vendors, cloud platforms, and financial institutions. Technical benchmarks comparing GPT-5.5-Cyber to Mythos are not yet available, and concerns persist regarding the containment of AI models capable of finding software flaws at scale.

Key takeaway

For CTOs and security leaders evaluating advanced AI for cyber defense, OpenAI's GPT-5.5-Cyber offers a more broadly accessible option compared to Anthropic's restricted Claude Mythos. You should assess its capabilities through the Trusted Access for Cyber program, particularly for government, critical infrastructure, or financial sector applications, while remaining mindful of the inherent risks in deploying AI capable of discovering software vulnerabilities at scale.

Key insights

OpenAI is deploying a specialized AI model, GPT-5.5-Cyber, to enhance cybersecurity defenses for critical infrastructure.

Principles

• Democratize cyber defense access
• Coordinate with government/industry
• Ensure deployment visibility

Method

OpenAI's cybersecurity action plan involves five pillars: democratizing access, coordinating with government/industry, enhancing safeguards, ensuring deployment visibility, and enabling user self-protection.

In practice

• Access via Trusted Access for Cyber program
• Utilize for critical infrastructure defense

Topics

• GPT-5.5-Cyber
• OpenAI Trusted Access
• Cybersecurity AI
• Claude Mythos Preview
• Zero-Day Exploits

Best for: CTO, AI Security Engineer, Security Engineer, Director of AI/ML

Related on AIssential

• Scaling Trusted Access for Cyber with GPT-5.5 and GPT-5.5-Cyber — OpenAI's new GPT-5.5 and GPT-5.5-Cyber models, with Trusted Access for Cyber, empower verified defenders.
• Our evaluation of OpenAI's GPT-5.5 cyber capabilities — GPT-5.5 demonstrates cyber vulnerability detection capabilities comparable to Claude Mythos.
• GPT-5.4-Cyber: Why OpenAI is Keeping its Most Powerful Model Under Lock and Key — OpenAI's GPT-5.4-Cyber offers advanced cybersecurity capabilities with restricted access to verified defenders.
• Introducing Trusted Access for Cyber — OpenAI's Trusted Access for Cyber provides controlled access to advanced AI models for defensive cybersecurity.
• GPT 5.4-Cyber & OpenAI's Trusted Access for Cyber Programme — OpenAI's new model and program aim to empower cyber defenders with specialized AI tools and controlled access.
• Cybersecurity experts blast US government for restricting Anthropic’s AI models — The US government's ban on Anthropic's AI models is criticized by experts for hindering defense capabilities and US AI competitiveness without sufficient justification.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Dataconomy.