Models · The Decoder ·
OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark
OpenAI launched the GPT-5.5-Cyber model, an updated Codex Security plugin, and a partner network of over 25 security firms and several governments under its Daybreak initiative. The company reported the model outperformed Anthropic's Mythos on cybersecurity benchmarks, with a focus shifting toward automated patching.