OpenAI has begun providing its cyberattack-focused AI, 'GPT-5.4-Cyber,' to security researchers, possibly in response to Anthropic, which offers Claude Mythos.

OpenAI has launched an initiative to provide security researchers with ' GPT-5.4-Cyber ,' an AI model with relaxed restrictions regarding cyberattacks. GPT-5.4-Cyber will be available to users participating in Trusted Access for Cyber (TAC) and will be used to help counter AI-based cyberattacks.

Trusted access for the next era of cyber defense | OpenAI
https://openai.com/index/scaling-trusted-access-for-cyber-defense/

GPT-5.4 has functional limitations to prevent its misuse in cyberattacks. GPT-5.4-Cyber is a model that relaxes the functional limitations of GPT-5.4 and is said to have been fine-tuned for executing cyberattacks. Although the detailed performance of GPT-5.4-Cyber has not been released, it is touted as having the performance to perform 'binary-based reverse engineering that can analyze the vulnerabilities and robustness of compiled software.'

OpenAI explains its resistance to GPT-5.4-Cyber for security researchers by stating that it is 'to prepare for the arrival of OpenAI's high-performance models in the coming months.' To use GPT-5.4-Cyber, you must join the TAC. Individuals can apply to join the TAC via the following link.

Trusted access for cybersecurity | ChatGPT
https://chatgpt.com/cyber

If you are a corporation, you need to apply to participate via the following link.

Apply for OpenAI Pilot: Trusted Access For Cyber | OpenAI
https://openai.com/ja-JP/form/enterprise-trusted-access-for-cyber/

Furthermore, rival company Anthropic is also undertaking similar initiatives, providing its AI model 'Claude Mythos Preview,' which boasts advanced saber attack capabilities, to some organizations to promote security research.

Anthropic develops 'Claude Mythos Preview,' an AI with extremely high cyberattack capabilities, and has also launched 'Project Glasswing,' which will provide a preview version to companies such as Microsoft and Apple - GIGAZINE