The current state of AI model access for cybersecurity in the EU represents a concerning disparity in corporate responsibility.
OpenAI has engaged in discussions with the European Union concerning access to its new cyber model, GPT-5.5-Cyber, a specialized variant of its latest AI model. As of 2026, OpenAI has agreed to provide the EU access to this model. This move suggests a recognition by OpenAI of the importance of international collaboration in cybersecurity, particularly within a regulatory body like the EU.
In contrast, Anthropic’s approach to its Mythos model presents a different picture. Anthropic released Mythos a month ago. However, the company has not yet granted the EU preview access to this model. This decision by Anthropic has raised concerns within the cybersecurity community, particularly regarding the potential for cyberattacks on critical software. The lack of EU access to Mythos, despite its release, creates a potential gap in the collective defense against emerging cyber threats.
The Technical Implications of Restricted Access
From a technical standpoint, the absence of access to a powerful model like Mythos for a regulatory body like the EU is problematic. AI models developed for cyber applications are not merely academic curiosities; they are tools with the potential to significantly alter the threat surface. When such models are released without corresponding provisions for governmental or intergovernmental bodies to understand and prepare for their capabilities, it introduces an element of risk.
The EU’s interest in these cyber models is not merely about defensive capabilities. It also concerns understanding the offensive potential of such AI. If a model can be used to identify vulnerabilities, then those vulnerabilities need to be understood and patched, regardless of the model’s intended use. Without access, the EU is effectively operating with incomplete information regarding a significant new AI development.
Policy and Precedent
OpenAI’s agreement to provide EU access to GPT-5.5-Cyber by 2026 sets a precedent. It indicates that major AI developers can and should engage with regulatory bodies to ensure that powerful new technologies are introduced responsibly. This kind of collaboration is vital for building trust and ensuring that the benefits of AI are realized without undue risks.
Anthropic’s current stance with Mythos, however, appears to deviate from this emerging norm. While the specifics of Anthropic’s discussions with the EU are not publicly detailed, the outcome—no EU preview access—stands in contrast to OpenAI’s commitment. This raises questions about the differing philosophies of AI governance and corporate responsibility among leading AI developers. The cybersecurity space requires a unified front, and differing approaches to access can create friction points.
Looking Ahead
The period leading up to 2026 will be critical. It will allow the EU to prepare for and integrate OpenAI’s GPT-5.5-Cyber into its cybersecurity frameworks. This preparation includes understanding the model’s capabilities, developing countermeasures for potential misuse, and training personnel. Such a lead time is important for any new technology that has far-reaching implications.
The situation with Anthropic and Mythos remains unresolved. The concerns about cyberattacks on critical software are valid, especially given the known capabilities of new AI models. For the security of the digital space, it is important that all major AI actors recognize the need for transparency and collaboration with governmental and intergovernmental bodies. The development of powerful AI models for cybersecurity must be matched with an equally strong commitment to responsible deployment and accessibility for oversight.
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