Over 1,500 customers have used both Anthropic and OpenAI models on Microsoft Foundry.

Judge as of 28 January 2026. True: Microsoft's records show that more than 1,500 customers had used both Anthropic and OpenAI models on Microsoft Foundry (Azure AI Foundry) by that date. Acceptable records include an earnings call transcript, an investor materials filing or a dated official announcement. Mostly true: the figure is slightly below 1,500 (within about 5%), or a minor definitional detail differs. Mostly false: the count is materially lower, or it counts customers using either provider rather than both. False: Anthropic models were not available on Foundry, or the count is far below 1,500.

Set before the research began.

1. E1 Microsoft Q2 earnings: CEO Nadella defends AI investments CRN UK (ChannelWeb) · 30 January 2026

   ““We offer the broadest selection of models of any hyperscaler,” he said, pointing to the more than 1,500 customers that have used Anthropic and OpenAI models on Microsoft’s Foundry AI application and agent factory.”

E2 is an independent report of Microsoft's Q2 FY2026 earnings call. It says Nadella cited more than 1,500 customers that have used Anthropic and OpenAI models on Foundry. The resolution criteria accept an earnings call as a record, and the report shows that Anthropic models were on Foundry and that the figure was above 1,500. The article's wording ("Anthropic and OpenAI models") does not say outright that each customer used both providers, but it matches the claim and gives no sign that the count was of customers using either one.