News

OpenAI Launches GPT-5.4-Cyber for Vetted Defenders Only

OpenAI Launches GPT-5.4-Cyber for Vetted Defenders Only

OpenAI's GPT-5.4-Cyber is a restricted model fine-tuned for defensive cybersecurity with binary reverse engineering and reduced refusal rates, available only through identity-verified access tiers - a direct response to Anthropic's Mythos Preview.