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From The Economist&rsquo;s World in Brief today: OpenAI said that GPT‑5.6 Sol, a frontier model, and another unreleased model hacked into a software company&rsquo;s system without being told to do so. The lab said the models escaped its testing environment, went online and stole login credentials for Hugging Face, an AI platform. Hugging Face said that it used a Chinese model to defend itself…