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.

Elon Musk, despite an ongoing lawsuit with Microsoft and OpenAI, appeared virtually at Microsoft’s Build conference. AI chatbot Grok will be hosted on Microsoft Azure. The move places Grok AI on the same platform alongside competitors like OpenAI’s ChatGPT and Meta’s models.