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OpenAI has signed a multi-year partnership with Amazon that combines a massive infrastructure commitment with a fresh equity investment, marking one of the largest cloud-AI tie-ups to date.

Under the agreement, Amazon said it will invest $50 billion in OpenAI, $15 billion upfront and an additional $35 billion tied to certain conditions in the coming months. The deal deepens OpenAI’s reliance on Amazon Web Services (AWS) infrastructure even as it maintains other major cloud relationships.

At the centre of the partnership is the joint development of a “Stateful Runtime Environment,” powered by OpenAI’s models and delivered through Amazon Bedrock.

Unlike stateless systems that respond to single prompts, stateful environments are designed to retain context, access memory, connect with external software tools and data sources, and tap into compute resources as needed. The aim is to support longer-running enterprise workflows, such as multi-step projects or agent-based systems, without developers having to stitch together separate infrastructure layers.

The environment will be integrated with Amazon Bedrock AgentCore and AWS infrastructure services, allowing AI agents to operate alongside other applications already running on AWS. The companies say the runtime is expected to launch in the coming months.

AWS will also become the exclusive third-party cloud distribution provider for OpenAI Frontier, the company’s enterprise platform for building and managing AI agents.

Frontier is positioned as a system that allows organizations to deploy teams of AI agents across internal business tools with built-in governance and security, without directly managing the underlying infrastructure. As companies move from pilot AI projects to full production deployments, the partnership gives AWS customers direct access to OpenAI’s most advanced enterprise offerings.

Beyond the equity investment, the companies are expanding their infrastructure pact. OpenAI and AWS are extending an existing $38 billion multi-year agreement by an additional $100 billion over eight years.

As part of this, OpenAI has committed to consuming roughly 2 gigawatts of AWS Trainium capacity, Amazon’s in-house AI training chips, to power Stateful Runtime, Frontier, and other advanced workloads.

The commitment spans both Trainium3 and the next-generation Trainium4 chips, expected to begin delivery in 2027. Trainium4 is projected to offer higher FP4 compute performance, increased memory bandwidth, and expanded high-bandwidth memory capacity, all critical for running increasingly complex AI models at scale.

For OpenAI, the arrangement secures long-term compute capacity amid rising global demand. For Amazon, it positions Trainium as a serious contender in the custom AI silicon market, competing with Nvidia GPUs and other in-house chip efforts from major cloud providers.

The partnership also includes collaboration on customised OpenAI models for Amazon’s internal teams. These tailored models could power Amazon’s customer-facing applications and AI agents, complementing Amazon’s existing Nova model family.

“OpenAI and Amazon share a belief that AI should show up in ways that are practical and genuinely useful for people,” said Sam Altman, CEO of OpenAI. “Combining OpenAI’s intelligence with Amazon’s infrastructure and global reach helps us put powerful AI into the hands of businesses and users at real scale.”

Microsoft Relationship Unchanged

The announcement comes amid continued scrutiny of OpenAI’s long-standing partnership with Microsoft.

Microsoft and OpenAI began working together in 2019, and their agreements include exclusive licensing rights to OpenAI’s intellectual property and Azure’s role as the exclusive cloud provider for stateless OpenAI APIs. According to Microsoft, nothing in the Amazon deal alters the existing commercial terms, IP arrangements, or revenue-sharing structure between the two companies.

Azure remains the exclusive cloud provider for stateless API access to OpenAI models, and OpenAI’s first-party products, including Frontier, will continue to be hosted on Azure. Microsoft has also clarified that its agreements anticipated OpenAI entering into additional cloud partnerships.