The announcement was made at Microsoft’s Build developer conference on Monday, and was notable given Microsoft’s partnership with OpenAI. Musk founded xAI, the startup behind Grok, but he has also been locked in a feud with OpenAI since stepping down from its board in the late 2010s, citing disagreements over its leadership direction.

“These models will have all the service level agreements (SLAs) Azure customers expect from any Microsoft product,” says Microsoft. The Grok AI models will be hosted and billed directly by Microsoft, and offered to its own product teams and customers through its Azure AI Foundry service.