AI has made significant advancements in detecting software vulnerabilities, exemplified by Claude Opus 4.6, which discovered 22 bugs in Firefox within just two weeks, of which 14 were classified as high-severity. This marks a stark contrast to six months ago when AI struggled to find deep vulnerabilities in hardened software. Notably, these bugs represented about 20% of all major flaws fixed by Mozilla in 2025, highlighting the effectiveness of new verification methods like task verifiers that enable AI to autonomously test code changes. Even with decades of strict auditing and fuzzing, Firefox contained blind spots that previous methods had missed, demonstrating the impact of this enhanced scanning capability.
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