This is today’s edition of The Download , our weekday newsletter that provides a daily dose of what’s going on in the world of technology. Meet GPT-Red: an LLM super-hacker OpenAI built to make its models safer OpenAI has built an LLM super-hacker called GPT-Red that it uses as a sparring partner to help its other models boost their defenses against cyberattacks. It automates a type of safety evaluation for software systems known as red-teaming, which is typically done by a team of human testers. The aim is to find as many different ways to break or hijack a system as possible. OpenAI gave MIT Technology Review an exclusive peek into the system. Find out how it could keep the company ahead of human attackers . —Will Douglas Heaven Why heat pumps are still so hot in the US —Casey Crownhart It feels as if it should be illegal to even think about heating appliances during the height of summer, but we need to talk about heat pumps. The appliances use electricity for heating, they’re incredibly efficient, and they’re on the rise. In the US, their sales have doubled over the past 15 years, according to a new report. They’re also winning the heating race against fossil fuels, outpacing natural-gas furnaces by 32% during the first quarter of 2026. These stats are especially striking at this moment, because a key tax credit for heat pumps just ended. So why are heat pumps still so hot? Read the full story for the answer . This article is from The Spark, our weekly climate tech newsletter. Sign up to receive it in your inbox every Wednesday. The must-reads I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology. 1 Elon Musk discreetly bought a $1 billion gas turbine firm to power Grok He acquired fossil fuel company APR Energy in May. ( Electrek ) + The most likely application will be powering AI data centers. ( Engadget ) + The deal was revealed through an FTC filing. ( Gizmodo ) + What will powe
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