After dissing Anthropic for limiting Mythos, OpenAI restricts access to Cyber, too

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

Summary

OpenAI is rolling out its new cybersecurity tool, GPT-5.5 Cyber, to "critical cyber defenders" with restricted access, a strategy mirroring Anthropic's approach with its competing Mythos tool. OpenAI's application process requires users to submit credentials and planned use cases to gain access. Cyber is designed to assist with tasks like penetration testing, vulnerability identification and exploitation, and malware reverse engineering, serving as a toolkit for companies to enhance their security posture. This controlled release aims to mitigate misuse by malicious actors, despite OpenAI CEO Sam Altman previously criticizing Anthropic's similar gatekeeping of Mythos as "fear-based marketing." OpenAI is collaborating with the U.S. government to expand access to more users with legitimate cybersecurity credentials.

Key takeaway

For cybersecurity leaders evaluating advanced defensive tools, OpenAI's GPT-5.5 Cyber offers capabilities in penetration testing and vulnerability analysis. You should consider applying for trusted access to assess its utility in your organization's security operations, while acknowledging the controlled rollout reflects industry concerns about potential misuse. Prioritize understanding the tool's limitations and security implications before integration.

Key insights

OpenAI's Cyber tool offers advanced cybersecurity capabilities under a restricted access model to prevent misuse.

Principles

• Controlled access mitigates misuse risk.
• Cybersecurity tools require careful deployment.

Method

OpenAI implements an application-based access model for GPT-5.5 Cyber, requiring credential submission and use case justification, followed by consultation with the U.S. government for broader, legitimate access.

In practice

• Apply for Cyber access via OpenAI's portal.
• Utilize Cyber for pen testing, vulnerability ID.

Topics

• OpenAI Cyber
• Anthropic Mythos
• Cybersecurity Tools
• Access Control
• Vulnerability Assessment

Best for: CTO, VP of Engineering/Data, Executive, AI Security Engineer, Security Engineer, Director of AI/ML

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