It’s now even easier to find—and exploit—vulnerabilities in computer systems using AI.Last Friday, the Chinese AI company Z.ai announced a powerful open-weight model that it says is capable of automating cutting-edge coding and cybersecurity tasks almost as well as the best publicly available models from Anthropic and OpenAI.The new model, GLM 5.3, could be a gift for companies looking to secure their systems against attacks, providing a cheaper way to scan for hidden bugs and other weaknesses. Open-weight—or free-to-download—models can be run on one’s own hardware and are often significantly less costly than closed models like Claude and GPT. Alongside…