GPT-5.5 Security Analysis: 'Mythos-Like Hacking, Open to All' Warns The New Stack

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The New Stack published a security analysis of GPT-5.5's native computer-use capabilities, warning that the same features enabling autonomous desktop navigation could be exploited for sophisticated attacks — drawing parallels to Anthropic's unreleased Mythos model's security concerns. The analysis examines how browser-based agent capabilities create new attack surfaces when models can click, type, and navigate autonomously without human oversight on each action.