The Download: brain-melting heatwaves and unprecedented OpenAI restrictions

The Trump administration has requested OpenAI to restrict the release of its next model, GPT 5.6, seeking to vet its initial users before a broader launch. This marks the first instance of a U.S. firm being directed to limit an AI model's deployment prior to its public availability. OpenAI has confirmed that all early partners will require government approval. Concurrently, Western Europe is experiencing a severe heatwave, with the UK recording its highest ever June temperature at 36.1 °C (97 °F) on Wednesday, and perceived temperatures reaching 39 °C. Scientists are investigating the impact of extreme heat on the human brain, with studies indicating increased irritability and violence, and diminished focus in individuals like firefighters after heat exposure. Research suggests that elevated temperatures can negatively affect children and those with mental health disorders, and laboratory animal studies point to potential alterations in brain chemical signaling due to excessive heat. The broader consequences of the heatwave are also affecting agriculture, infrastructure, and healthcare systems across the continent. Meanwhile, Anthropic is reportedly still engaged in discussions with Washington.