In February 2026, Claude Opus 4.6 changed cybersecurity history by discovering 22 critical vulnerabilities in Firefox in just 2 weeks. It proved that no code, not even 40-year-old software, is safe from AI analysis.
February 2026 was the month Claude Opus 4.6 changed cybersecurity history. In just 2 weeks, this AI discovered 22 security vulnerabilities in Firefox browser — more than human security teams typically
find in an entire month. But this was only the beginning. When Mark Russinovich, Microsoft Azure CTO, fed his 40-year-old Apple II code to Claude, even those ancient programs weren't safe from AI analysis.
[IMAGE_PLACEHOLDER_1] March 11, 2026 — The day the world realized AI can not only write code, but can also be the world's best hacker. Claude Opus 4.6, Anthropic's latest model, proved in a collaboration
with Mozilla that artificial intelligence can discover security vulnerabilities with unprecedented speed and accuracy. The results were staggering: 22 vulnerabilities in Firefox, 14 of them high-severity,
all discovered within 2 weeks. This while human security teams typically find fewer vulnerabilities in an entire month of work. But the story doesn't end there — Claude even managed to analyze 40-year-old
Apple II code and find security issues. The Firefox Experiment: Historic Anthropic-Mozilla Partnership [IMAGE_PLACEHOLDER_2] February 2026, Mozilla made a bold decision: allowing an AI to completely analyze
Firefox browser code. This was the first time a major software company had given such comprehensive access to an artificial intelligence system. Experiment Setup: Claude vs Firefox Claude Opus 4.6 received
full access to Firefox source code. The goal was simple: find security vulnerabilities that human teams had missed. But Claude's methodology was something that surprised even Anthropic researchers. Instead
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