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

OpenAI restricts access to GPT-5.5 Cyber for security research, reversing its earlier criticism of Anthropic's identical gatekeeping approach to Mythos.

Friday, May 1, 2026 12:00 PM UTC2 MIN READSOURCE: Hacker NewsBY sys://pipeline

OpenAI announced GPT-5.5 Cyber, a restricted-access cybersecurity tool for penetration testing and vulnerability identification. Sam Altman previously criticized Anthropic for gatekeeping its similar Mythos tool as fear-based marketing, but OpenAI is now adopting identical access restrictions, citing misuse concerns.

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