DeepSeek-R1 is a blockbuster open-source model that is now at the top of the U.S. App Store.

Microsoft Corp. and OpenAI are investigating whether data output from OpenAI’s technology was obtained in an unauthorized manner by a group linked to Chinese artificial intelligence startup DeepSeek, according to people familiar with the matter.

OpenAI shocked that an AI company would train on someone else's data without permission or compensation.

The largest study yet into the effects of cannabis on the brains of 18- to 36-year-olds has found that the drug can reduce brain function during cognitive tests. The findings will help people to make an informed decision about the pros and cons of using cannabis.