OpenAI’s GPT-5.5 Cyber AI Beats Anthropic’s Banned Mythos Model—And Nobody’s Shutting It Down
In brief OpenAI released GPT-5.5-Cyber, a model designed to help find and fix software vulnerabilities faster than previous versions. It outperforms Anthropic’s Mythos on key benchmarks, while Mythos faces a U.S. government ban over national security concerns. The model is being released to trusted defenders with controls, in contrast to Anthropic’s more restricted approach. OpenAI’s…