After Anthropic refused to restrict Mythos, OpenAI restricted access to Cyber ​​as well

After Sam Altman called Anthropic petty about guarding its cybersecurity tool Mythos by only releasing it to select users, he confirmed that OpenAI would do the same with its competing tool, Cyber.

Altman said in a post on X on Thursday that OpenAI will begin rolling out GPT-5.5 Cyber ​​to “critical cyber defenders” in the next few days. OpenAI has an app on its website where people provide information about their credentials and planned usage in order to gain access.

Cyber ​​can perform tasks like penetration testing, identifying (and exploiting) vulnerabilities, and reverse engineering malware, the app notes. It is intended to serve as a toolkit to help a company find vulnerabilities and test defenses. The fear is that the group may be misused by bad guys.

When Anthropic similarly restricted access to Mythos, Altman called the tactic fear-based marketing. Some critics think so too, saying that the Anthropic rhetoric is overblown. Ironically, an unauthorized group gained access to Mythos anyway.

OpenAI says it is working to make Cyber ​​more widely available by consulting with the US government and identifying more users with legitimate cybersecurity credentials.