Simply sign up to the Artificial intelligence myFT Digest -- delivered directly to your inbox. OpenAI says it has found evidence that Chinese artificial intelligence start-up DeepSeek used the US ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. As Christmas approached, lawyers at US firms across the City of London and Wall Street rushed to hit tough ...

By selling points or air miles to third parties, such as banks or credit card companies, airlines forged a hugely valuable source of revenue. The loyalty programmes of the big three US airlines alone ...