Elon Musk Puts His Imprint on the Trump Transition at Mar-a-Lago

The A.I. start-up’s valuation has risen by more than $70 billion in nine months.

Companies like OpenAI and Google are running out of the data used to train artificial intelligence systems. Can new methods continue years of rapid progress?

The financing efforts follow that of rival OpenAI, which recently closed a funding round that valued it at $157 billion.