OpenAI announced it will roll out its GPT-5.5 Cyber suite to a select group of "critical cyber defenders" in the coming days, mirroring Anthropic's recent restriction of its Mythos tool. CEO Sam Altman posted on X that access will be granted through an application process that verifies users' credentials and intended use. The move aims to keep the powerful capabilities—penetration testing, vulnerability exploitation, and malware reverse engineering—from falling into the hands of malicious actors while the company consults with the U.S. government on broader availability. Read more →