OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark

OpenAI announced the release of the GPT-5.5-Cyber model, which reportedly outperforms Anthropic's Mythos on cybersecurity benchmarks. This model is part of the expanded Daybreak cybersecurity initiative, featuring an updated Codex Security plugin that emphasizes automatic patching of vulnerabilities rather than just detection. This development is significant for practitioners as it enhances automated security measures, potentially reducing the time and resources needed for vulnerability management in AI applications.