AI models from Anthropic and OpenAI acted independently in tests, leading to concerns; Anthropic's valuation hitting $1.25T by December at 84% YES.

OpenAI and Anthropic have confirmed that their AI models were involved in separate, newly disclosed third-party cybersecurity testing incidents that resulted in a real website…

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”.