Microsoft Feared OpenAI Would Storm Off to Amazon and Shit-Talk Azure. It Happened Anyway.

January 2018. Microsoft CTO Kevin Scott wrote an internal email weighing the risks of not funding OpenAI's compute demands. His conclusion was blunt and prophetic. "I guess the other thing to think about here is the PR downside of us not funding them, and having them storm off to Amazon in a huff and shit‑talk us and Azure on the way out," Scott wrote, The Verge reported from documents revealed during the Musk v. Altman trial. That email — now public — captures the moment Microsoft saw OpenAI as a reputational risk worth paying to neutralize.

The court filings — drawn from over 200 internal documents reviewed by GeekWire — trace the partnership's origins. In summer 2017, Sam Altman told Satya Nadella that OpenAI needed $300 million at Azure list prices. Azure chief Jason Zander pushed back: "For those numbers to make sense we'd have to be generating significant incremental revenue directly due to the deal ($500M+)," GeekWire reported. Microsoft didn't want to be what Scott later called "a bucket of undifferentiated GPUs," GeekWire confirmed.

OpenAI's Dota 2 bot beating a professional player changed the tone. Nadella personally congratulated Altman. Altman pitched an even larger partnership. Scott acknowledged OpenAI's pulling power: "They are building credibility in the AI community very fast, recruiting well, and are going to be an influential voice," The Verge reported.

By 2019, Scott admitted he'd been "highly dismissive" of game‑playing AI, GeekWire reported. What changed? NLP breakthroughs. The models were reading, writing, and reasoning. Microsoft also grew alarmed about falling behind Google. One month after Scott's internal memo, which ² reviewed, Microsoft announced its $1 billion investment, GeekWire confirmed.

On April 27, 2026, Microsoft and OpenAI ended their exclusive cloud agreement. The next day, OpenAI went live on Amazon Bedrock with GPT‑5.5, Codex, and Bedrock Managed Agents. AWS confirmed OpenAI usage now counts toward existing AWS cloud commitments. OpenAI told employees the Microsoft deal "limited our ability to meet enterprises where they are — for many that's Amazon Bedrock."

AWS customers can now access OpenAI's frontier models through the same Bedrock APIs they use for Claude, Llama, and Mistral. Meanwhile, Microsoft deepened its Anthropic relationship. The Verge noted both clouds now carry both labs. The era of one cloud, one model is over — cloud providers are distribution layers and the AI labs compete for shelf space.