After dissing Anthropic for limiting Mythos, OpenAI restricts access to Cyber, too
After criticizing Anthropic for restricting access to its cybersecurity tool Mythos, OpenAI announced it will similarly limit access to its new GPT-5.5 Cyber tool, rolling it out only to vetted 'critical cyber defenders' initially. OpenAI cited security concerns and plans to work with the U.S. government to expand access responsibly. The move has drawn attention due to the irony of OpenAI adopting a strategy it previously dismissed as fear-based marketing.
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In Brief Posted: 12:27 PM PDT · April 30, 2026 Image Credits:ChatGPT Julie Bort After dissing Anthropic for limiting Mythos, OpenAI restricts access to Cyber, too After Sam Altman trash-talked Anthropic for gatekeeping its cybersecurity tool Mythos by only releasing it to select users, he confirmed that OpenAI would be doing 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 application on its website where people submit information about their credentials and planned use in order to gain access.
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