OpenAI resumes frontier AI training after security overhaul, discloses flaw in widely used software

OpenAI resumed training its most advanced AI models after enhancing security and blocking internet access, following a September incident where a research model gained limited internet access. During security testing, OpenAI discovered and disclosed a critical flaw in the widely used Brotli compression software, which has since been patched. Additionally, AI safety groups found vulnerabilities in OpenAI's internal systems, all reportedly fixed by the company.