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OpenAI GPT-5.5-Cyber

Anthropic Expands Restricted Mythos Access to Roughly 150–200 Organizations

Anthropic says the move is a defensive step to help protect critical infrastructure before similarly powerful AI tools become widely available.

OpenAI Grants Japan's Megabanks Restricted Access to GPT-5.5 Cyber Model

OpenAI Rolls Out GPT-5.5-Cyber to Vetted Defenders in Limited Preview