OpenAI Launches GPT-5.4-Cyber with Expanded Access for Security Teams

I cannot summarize this article because no actual article content was provided beyond the headline. The body text simply repeats the headline without any substantive details about the product, its capabilities, pricing, availability, or what ‘expanded access’ entails.

To produce an accurate summary, I would need the full article text covering what GPT-5.4-Cyber offers, how it differs from existing models, and what the expanded access program looks like for security teams.