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.

In a move that could redefine its AI alliances, Microsoft has added Elon Musk’s Grok to Azure AI Foundry—making the controversial xAI model available to developers and enterprises through the same platform that powers OpenAI’s ChatGPT.

Starting this week, users of Azure AI Foundry will be able to purchase licences for xAI’s models under the same commercial terms as OpenAI’s — including premium access to cloud computing power and integration into Microsoft’s enterprise tools. This development gives developers “service parity” whether they choose Musk’s models or those from OpenAI.