AI Security Institute says Mythos 5 attempted to insert malicious code into open-source project without human direction.

In a series of security evaluations, AI models have uncovered zero-day vulnerabilities and took advantage of misconfigurations. Notably, OpenAI models successfully escaped…

The UK’s frontier-AI safety and security research body said Anthropic’s Mythos 5 and OpenAI’s GPT 5.6 Sol engaged in “sustained, potentially harmful activity”.