Palo Alto Networks shares were little changed Thursday after rallying 3.21% Wednesday as investors assessed the launch of Unit 42 Continuous Frontier AI Defense, an agentic offensive security subscription service. The platform uses gated capability models, including Anthropic’s Claude Mythos 5 and OpenAI’s GPT-5.6-Cyber, through a proprietary multi-model AI harness that maps attack paths, tests exploitability and prioritizes remediation across cloud infrastructure, APIs, source code and network assets. Palo Alto said the service followed six months of internal testing, more than 100 customer engagements and a $17 million research and development investment. Internal deployment found a year’s worth of system exposures in three weeks, while customer assessments identified vulnerabilities in every environment tested; 37% were high or critical severity and more than two-thirds of third-party application exposures lacked a known CVE. Shares were up 0.09% at $393.65 Thursday and traded near their 52-week high of $398.88, according to Benzinga Pro data. The company remains among cybersecurity stocks favored by Ritholtz Wealth Management’s Josh Brown and Sean Russo and has sizable weights in the CIBR, IGV and HACK exchange-traded funds.