OpenAI shifts cloud partners

OpenAI is publicly leaning on Amazon for cloud and sales while telling staff that Microsoft has become a constraint. (axios.com) The shift showed up in an internal memo sent Sunday, April 12, by chief revenue officer Denise Dresser, according to CNBC and The Verge. Dresser wrote that the Microsoft partnership was “foundational” but said it had also limited OpenAI’s ability to reach companies that buy artificial intelligence through Amazon Web Services’ Bedrock marketplace. (cnbc.com, theverge.com) Amazon and OpenAI made that relationship formal on February 27, 2026, when they announced a multi-year strategic partnership and Amazon said it would invest $50 billion, starting with $15 billion and adding another $35 billion if conditions are met. OpenAI said Amazon Web Services would distribute OpenAI Frontier and supply 2 gigawatts of Trainium computing capacity. (openai.com) That matters because cloud deals are not just about renting servers. The cloud company controls where models are sold, how easily corporate buyers can test them, and which chips train and run them. (openai.com, cnbc.com) OpenAI has spent the past year spreading those bets across several providers. In November 2025, it said Amazon Web Services would run core workloads under a $38 billion agreement, and in July 2025 it said Oracle would add 4.5 gigawatts of Stargate data center capacity in the United States, bringing total Stargate capacity under development above 5 gigawatts and 2 million chips. (openai.com, openai.com) Microsoft is still deeply tied to OpenAI. Microsoft has invested more than $13 billion since 2019, and the companies said in October 2025 that they had signed a new definitive agreement for the next phase of their partnership. (cnbc.com, blogs.microsoft.com) The memo also showed how directly OpenAI is targeting Anthropic in big-company sales. The Verge reported that Dresser’s four-page note repeated the word “moat” and framed user switching between models as a threat, while Axios said OpenAI criticized Anthropic’s revenue claims as it tried to win enterprise accounts. (theverge.com, axios.com) OpenAI’s urgency is tied to where the money is. Dresser told CNBC earlier in April that enterprise customers generate 40% of OpenAI revenue and that the business is on track to reach parity with consumer revenue by the end of 2026. (cnbc.com) OpenAI is not cutting Microsoft loose, but it is making sure no single partner controls its compute, distribution, or corporate pipeline. The latest memo turned that strategy into plain language. (cnbc.com, openai.com)