OpenAI Rolls Out GPT-5.5-Cyber to Vetted Defenders, a Month After Mocking Anthropic's Mythos as 'Fear-Based Marketing'
OpenAI launched GPT-5.5-Cyber on May 7, 2026 to vetted security teams via its Trusted Access for Cyber program, after CEO Sam Altman publicly criticized Anthropic's restricted Mythos rollout.
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