OpenAI GPT-5.4-Cyber: Defensive Cybersecurity AI Complete Guide 2026
May 2 · 10 min read · OpenAI launched GPT-5.4-Cyber on April 14, 2026 — and it is the most significant shift in AI-powered cybersecurity since the field began taking AI seriously. The model is a specialized fine-tune of GPT-5.4, engineered to lower the refusal boundary fo...
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