OpenAI’s push into enterprise AI has taken a sharper turn as internal tensions around cloud partnerships with Microsoft and Amazon spill into public view, with senior leadership pointing to shifting customer demand and infrastructure constraints shaping its next phase of growth.
Enterprise Demand Moves Toward Amazon Bedrock Platform
OpenAI’s chief revenue officer Denise Dresser told staff in an internal memo that enterprise customers are increasingly leaning toward Amazon Web Services’ ecosystem, particularly Bedrock, for AI model access.
She wrote,
“Our Microsoft partnership has been foundational to our success. But it has also limited our ability to meet enterprises where they are — for many that’s Bedrock.”
Dresser added that demand has accelerated since the Amazon collaboration was announced, describing inbound interest as “frankly staggering.”
She also said enterprise clients now account for around 40% of OpenAI’s revenue, with expectations that this could match its consumer business by year end.
Microsoft Partnership Under Pressure Over Enterprise Access
Microsoft remains one of OpenAI’s most important backers, having invested more than $13 billion since 2019 and played a central role in scaling ChatGPT and related products.
However, Dresser said the long-standing arrangement has made it harder to reach businesses operating primarily within Amazon’s cloud environment.
Many enterprise customers, she noted, rely on Amazon’s infrastructure and tools rather than Microsoft’s Azure stack.
The memo highlights growing friction between the two firms as both expand deeper into AI.
Microsoft has even listed OpenAI as a competitor in regulatory filings, while still maintaining deep integration across its Copilot and Azure OpenAI services.
Amazon Expands AI Footprint With Major OpenAI Deal
Amazon has become a central part of OpenAI’s enterprise strategy following a major partnership expansion announced earlier this year.
Under the arrangement, Amazon plans to invest up to $50 billion in OpenAI.
An existing AWS contract worth $38 billion has also been extended by $100 billion over eight years.
OpenAI is additionally set to use two gigawatts of computing power through AWS infrastructure powered by Trainium chips.
The shift reflects a broader move to reduce reliance on a single cloud provider and improve access for enterprise customers already embedded in Amazon’s ecosystem.
Azure Commitment and Reshaped Microsoft Terms
Despite the pivot, Microsoft retains significant control within the revised structure.
Stateless OpenAI API traffic continues to run exclusively through Azure, while Microsoft keeps sole licensing rights over OpenAI’s core intellectual property, which powers tools like Copilot and Bing integrations.
A renegotiated deal in October 2025 also gave OpenAI greater flexibility to co-develop products with third parties and removed Microsoft’s right of first refusal over compute resources.
In return, OpenAI committed to an additional $250 billion in Azure spending, according to Geekwire.
Rivalry With Anthropic and Revenue Disputes Surface
Competition in the enterprise AI space is also intensifying with Anthropic emerging as a key rival, particularly through its early integration with Amazon’s Bedrock platform.
Dresser criticised Anthropic’s reporting practices in the memo, stating:
“They use accounting treatment that makes revenue look bigger than it is, including grossing up rev share with Amazon and Google. We report Microsoft rev share net, which is more inline with standards we would be held to as a public company.”
She also claimed Anthropic’s reported run-rate revenue of more than $30 billion may be “inflated” by around $8 billion.
Cloud Rivalry Shapes Next Phase of AI Enterprise Market
The memo reflects a wider shift in how leading AI firms are positioning themselves across competing cloud ecosystems, as enterprise clients prioritise flexibility and easier access to multiple models.
Microsoft continues to hold key rights under its agreement, while Amazon strengthens its role as a distribution hub for AI services through Bedrock.
OpenAI, meanwhile, is balancing long-term commitments with Microsoft while expanding aggressively into Amazon’s enterprise network to meet accelerating demand.
Miyuki
