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.

Microsoft is bringing the Grok 3 and Grok 3 mini AI models from Elon Musk’s xAI to its Azure AI Foundry platform, as new offerings hosted and billed directly by Microsoft from within the company’s cloud platform.