GPT-5.5-Cyber beats Mythos: Update for OpenAI's security model

With a security initiative, OpenAI competes with Anthropic's Mythos and also offers a security review service for open-source projects.
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OpenAI Says GPT-5.5-Cyber Leads Claude Mythos, Expands Daybreak-Initiative

OpenAI is now turning its Daybreak initiative into a defensive cybersecurity program that combines Codex updates, the GPT-5.5-Cyber release and partner access for approved organizations. As OpenAI ...