Days after rival Anthropic launched Mythos, OpenAI announces GPT-5.4-Cyber AI model built for cybersecurity defenders
OpenAI has launched GPT-5.4-Cyber, a specialized version of its GPT 5.4 model designed for defensive cybersecurity.
This new variant lowers refusal boundaries for legitimate security work, enabling advanced defensive workflows like binary reverse engineering.
The model is initially available to vetted security vendors, organizations, and researchers through a controlled access program.
Anthropic's Mythos sparks security fears
- Anthropic’s Mythos Is a Wake-up Call For Everyone, Not Just Banks Bloomberg —
- Bessent Calls Anthropic’s Mythos a Breakthrough in China AI Race Bloomberg —
- Anthropic draws investor interest at $800B valuation; Bessent hails Mythos as key edge in AI race with China Seeking Alpha —
- Anthropic wins accolades from Canada’s AI minister over Mythos approach The Japan Times —
- The Crypto Bros Want to Get Their Hands on Anthropic’s ‘Super Dangerous’ Model Gizmodo —