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

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OpenAI on Tuesday unveiled GPT-5.4-Cyber, a variant of its latest flagship model, GPT‑5.4, that’s specifically optimized for defensive cybersecurity use cases, days after rival Anthropic unveiled its own frontier model, Mythos.
« The progressive use of AI accelerates defenders – those responsible for keeping systems, data, and users safe – enabling them to find and fix problems

Source : https://thehackernews.com/2026/04/openai-launches-gpt-54-cyber-with.html