› Brian Grinstead, a Firefox engineer at Mozilla, noted regarding GPT-6 Cyber that the browser entered 2026 as one of the most hardened and audited codebases in the world, yet the model still uncovered previously unknown, severe vulnerabilities.
› The number shared by OpenAI is 81.
› I decided to verify it in the only place possible without direct access to the model: Mozilla's official security advisories.
› Key takeaways 81 new vulnerabilities rated as high severity by Mozilla, complete with proof-of-concept exploits and reproducible test cases.