Sam Altman, chief executive officer of OpenAI Inc., during a media tour of the Stargate AI data center in Abilene, Texas, US, on Tuesday, Sept. 23, 2025. Kyle Grillot | Bloomberg | Getty ImagesBroadcom and OpenAI have made their partnership official.The two companies said Monday that they're jointly building and deploying 10 gigawatts of custom artificial intelligence accelerators as part of a broader effort across the industry to scale AI infrastructure. Financial terms weren't disclosed.Broadc...