OpenAI memo claims Microsoft limited reach as Amazon demand surges

Monday 13 April 2026 - 16:20

By: Dakir Madiha

OpenAI memo claims Microsoft limited reach as Amazon demand surges

An internal OpenAI memo by revenue chief Denise Dresser portrays the partnership with Amazon Web Services as a key driver of enterprise growth, while candidly admitting the long-standing Microsoft tie has "limited our ability" to serve customers on their preferred cloud platforms. Dresser, who joined OpenAI in December after leading Slack as CEO, wrote the note to her teams. It highlights how swiftly Amazon has become a commercial priority, with the enterprise segment now at 40 percent of total revenue and on track to match consumer revenue by end-2026.

Dresser described enterprise demand since the late February Amazon announcement as "stunning," with many clients favoring access to OpenAI models through AWS's Bedrock platform. The February 26 deal included Amazon's commitment to invest up to $50 billion in OpenAI and made AWS the exclusive third-party cloud distributor for OpenAI's enterprise Frontier platform. OpenAI pledged to use about 2 gigawatts of Amazon's custom Trainium chips and expand an existing eight-year, $100 billion cloud agreement.

The memo's blunt language on Microsoft constraints signals a deeper shift in the relationship. Microsoft invested over $13 billion in OpenAI since 2019 but listed it as a competitor for the first time in its fiscal 2024 annual report. In September 2025, they signed a non-binding memorandum ending Microsoft's exclusive cloud provider role, freeing OpenAI to expand to other platforms.

OpenAI has since diversified infrastructure, adding Google Cloud, Oracle, and CoreWeave alongside Azure. Microsoft builds its own frontier AI models, with Microsoft AI CEO Mustafa Suleyman telling Bloomberg the firm aims for "state-of-the-art" capabilities by 2027. This evolution marks a transition from partnership to rivalry, as OpenAI eyes a potential IPO late 2026 or early 2027 at a recent $852 billion valuation.

Brad Lightcap, former OpenAI COO, shifted to "special projects," with Dresser taking most business duties. The memo frames Amazon not just as infrastructure but a strategic counterweight to years of Microsoft dependence. This appeals to enterprise clients seeking flexibility and positions OpenAI favorably for investors ahead of public markets, amid intensifying cloud and AI competition.