OpenAI announced the release of GPT-5.4-Cyber, a defensive‑focused AI model with lowered refusal limits and binary reverse‑engineering capabilities. The company also scaled its Trusted Access for Cyber programme, moving from a pilot to thousands of vetted individual security professionals and hundreds of enterprise teams. The move counters Anthropic’s recent restriction of its Mythos model to a handful of large organisations, highlighting a split in how leading AI firms handle the dual‑use risks of cybersecurity tools. Read more →