OpenAI scaled up its Trusted Access for Cyber program on April 15, releasing GPT-5.4-Cyber — a fine-tuned version of GPT-5.4 with a lower refusal threshold for legitimate security work, including binary reverse engineering of compiled binaries without source access. Access is tiered: individuals verify at chatgpt.com/cyber, while enterprises apply through OpenAI directly; approved organizations include Bank of America, BlackRock, Cisco, Cloudflare, CrowdStrike, Goldman Sachs, and JPMorgan. OpenAI then briefed roughly 50 US federal cyber officials in Washington on April 22 and has begun Five Eyes partner outreach this week, per Axios reporting. The program runs in parallel to Anthropic's gated Mythos model, signaling an emerging pattern of frontier labs offering separate, permissioned tiers for defense use cases.