The company is also expanding its Trusted Access for Cyber programme [File] | Photo Credit: AP OpenAI on Tuesday unveiled GPT-5.4-Cyber, a variant of its latest flagship model fine-tuned specifically for defensive cybersecurity work, following rival Anthropic’s announcement of frontier AI model Mythos. Mythos, announced on April 7, is being deployed as part of Anthropic’s “Project Glasswing”, a controlled initiative under which select organisations are permitted to use the unreleased Claude Mythos Preview model for defensive cybersecurity purposes. It has found “thousands” of major vulnerabilities in operating systems, web browsers and other software. Published – April 15, 2026 09:57 am IST Share this: Click to share on WhatsApp (Opens in new window) WhatsApp Click to share on Facebook (Opens in new window) Facebook Click to share on Threads (Opens in new window) Threads Click to share on X (Opens in new window) X Click to share on Telegram (Opens in new window) Telegram Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Pinterest (Opens in new window) Pinterest Click to email a link to a friend (Opens in new window) Email More Click to print (Opens in new window) Print Click to share on Reddit (Opens in new window) Reddit Click to share on Tumblr (Opens in new window) Tumblr Click to share on Pocket (Opens in new window) Pocket Click to share on Mastodon (Opens in new window) Mastodon Click to share on Nextdoor (Opens in new window) Nextdoor Click to share on Bluesky (Opens in new window) Bluesky Like this:Like Loading... Post navigation Delimitation cannot be an excuse for domination: Siddaramaiah Sanctioned tanker turns back to Strait of Hormuz, day after Gulf exit