OpenAI releases GPT-5.4-Cyber for vetted security teams, scaling Trusted Access programme
In short: OpenAI is releasing GPT-5.4-Cyber, a model fine-tuned for defensive cybersecurity with lowered refusal boundaries and binary reverse engineering capabilities, and scaling its Trusted Access for Cyber programme to thousands of verified defenders. The move comes a week after Anthropic restricted its more powerful Mythos model to just 11 organisations, setting up a philosophical split: OpenAI bets on broad verified access while Anthropic opts for tightly gated deployment.